diff --git a/src/Umbraco.Core/Models/PublishedContent/ILivePublishedModelFactory.cs b/src/Umbraco.Core/Models/PublishedContent/ILivePublishedModelFactory.cs
index 0810f2207b..39b9f038be 100644
--- a/src/Umbraco.Core/Models/PublishedContent/ILivePublishedModelFactory.cs
+++ b/src/Umbraco.Core/Models/PublishedContent/ILivePublishedModelFactory.cs
@@ -1,5 +1,21 @@
 namespace Umbraco.Core.Models.PublishedContent
 {
+    /// <summary>
+    /// Provides a live published model creation service.
+    /// </summary>
+    public interface ILivePublishedModelFactory2 : ILivePublishedModelFactory
+    {
+        /// <summary>
+        /// Tells the factory that it should build a new generation of models
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// If the live model factory 
+        /// </summary>
+        bool Enabled { get; }
+    }
+
     /// <summary>
     /// Provides a live published model creation service.
     /// </summary>
diff --git a/src/Umbraco.Core/PublishedModelFactoryExtensions.cs b/src/Umbraco.Core/PublishedModelFactoryExtensions.cs
index ac8c9f1be7..697e3fd11f 100644
--- a/src/Umbraco.Core/PublishedModelFactoryExtensions.cs
+++ b/src/Umbraco.Core/PublishedModelFactoryExtensions.cs
@@ -17,6 +17,20 @@ namespace Umbraco.Core
         /// <returns></returns>
         public static bool IsLiveFactory(this IPublishedModelFactory factory) => factory is ILivePublishedModelFactory;
 
+        /// <summary>
+        /// Returns true if the current <see cref="IPublishedModelFactory"/> is an implementation of <see cref="ILivePublishedModelFactory2"/> and is enabled
+        /// </summary>
+        /// <param name="factory"></param>
+        /// <returns></returns>
+        public static bool IsLiveFactoryEnabled(this IPublishedModelFactory factory)
+        {
+            if (factory is ILivePublishedModelFactory2 liveFactory2)
+                return liveFactory2.Enabled;
+
+            // if it's not ILivePublishedModelFactory2 we can't determine if it's enabled or not so return true
+            return factory is ILivePublishedModelFactory;
+        }
+
         [Obsolete("This method is no longer used or necessary and will be removed from future")]
         [EditorBrowsable(EditorBrowsableState.Never)]
         public static void WithSafeLiveFactory(this IPublishedModelFactory factory, Action action)
@@ -50,15 +64,17 @@ namespace Umbraco.Core
             {
                 lock (liveFactory.SyncRoot)
                 {
-                    // TODO: Fix this in 8.3! - We need to change the ILivePublishedModelFactory interface to have a Reset method and then when we have an embedded MB
-                    // version we will publicize the ResetModels (and change the name to Reset).
-                    // For now, this will suffice and we'll use reflection, there should be no other implementation of ILivePublishedModelFactory.
-                    // Calling ResetModels resets the MB flag so that the next time EnsureModels is called (which is called when nucache lazily calls CreateModel) it will
-                    // trigger the recompiling of pure live models.
-                    var resetMethod = liveFactory.GetType().GetMethod("ResetModels", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
-                    if (resetMethod != null)
-                        resetMethod.Invoke(liveFactory, null);
-
+                    if (liveFactory is ILivePublishedModelFactory2 liveFactory2)
+                    {
+                        liveFactory2.Reset();
+                    }
+                    else
+                    {
+                        // This is purely here for backwards compat and to avoid breaking changes but this code will probably never get executed
+                        var resetMethod = liveFactory.GetType().GetMethod("ResetModels", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
+                        if (resetMethod != null)
+                            resetMethod.Invoke(liveFactory, null);
+                    }
                     action();
                 }
             }
diff --git a/src/Umbraco.Core/Runtime/SqlMainDomLock.cs b/src/Umbraco.Core/Runtime/SqlMainDomLock.cs
index f3bfe4eefc..5f5d0d607f 100644
--- a/src/Umbraco.Core/Runtime/SqlMainDomLock.cs
+++ b/src/Umbraco.Core/Runtime/SqlMainDomLock.cs
@@ -3,8 +3,10 @@ using System.Data;
 using System.Data.SqlClient;
 using System.Diagnostics;
 using System.Linq;
+using System.Security.Cryptography;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Web;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Persistence.Dtos;
@@ -16,7 +18,7 @@ namespace Umbraco.Core.Runtime
     internal class SqlMainDomLock : IMainDomLock
     {
         private string _lockId;
-        private const string MainDomKey = "Umbraco.Core.Runtime.SqlMainDom";
+        private const string MainDomKeyPrefix = "Umbraco.Core.Runtime.SqlMainDom";
         private const string UpdatedSuffix = "_updated";
         private readonly ILogger _logger;
         private IUmbracoDatabase _db;
@@ -126,6 +128,16 @@ namespace Umbraco.Core.Runtime
 
         }
 
+        /// <summary>
+        /// Returns the keyvalue table key for the current server/app
+        /// </summary>
+        /// <remarks>
+        /// The key is the the normal MainDomId which takes into account the AppDomainAppId and the physical file path of the app and this is
+        /// combined with the current machine name. The machine name is required because the default semaphore lock is machine wide so it implicitly
+        /// takes into account machine name whereas this needs to be explicitly per machine.
+        /// </remarks>
+        private string MainDomKey { get; } = MainDomKeyPrefix + "-" + (NetworkHelper.MachineName + MainDom.GetMainDomId()).GenerateHash<SHA1>();
+
         private void ListeningLoop()
         {
             while (true)
diff --git a/src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs b/src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs
index 8e8a19c729..0e125759c6 100644
--- a/src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs
+++ b/src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs
@@ -21,7 +21,7 @@ using File = System.IO.File;
 
 namespace Umbraco.ModelsBuilder.Embedded
 {
-    internal class PureLiveModelFactory : ILivePublishedModelFactory, IRegisteredObject
+    internal class PureLiveModelFactory : ILivePublishedModelFactory2, IRegisteredObject
     {
         private Assembly _modelsAssembly;
         private Infos _infos = new Infos { ModelInfos = null, ModelTypeMap = new Dictionary<string, Type>() };
@@ -134,6 +134,16 @@ namespace Umbraco.ModelsBuilder.Embedded
             return ctor();
         }
 
+        /// <inheritdoc />
+        public bool Enabled => _config.Enable;
+
+        /// <inheritdoc />
+        public void Reset()
+        {
+            if (_config.Enable)
+                ResetModels();
+        }
+
         #endregion
 
         #region Compilation
diff --git a/src/Umbraco.Web/Editors/ExamineManagementController.cs b/src/Umbraco.Web/Editors/ExamineManagementController.cs
index 0953b41cac..cf1dfd5d5d 100644
--- a/src/Umbraco.Web/Editors/ExamineManagementController.cs
+++ b/src/Umbraco.Web/Editors/ExamineManagementController.cs
@@ -141,9 +141,6 @@ namespace Umbraco.Web.Editors
 
             try
             {
-                //clear and replace
-                index.CreateIndex();
-
                 var cacheKey = "temp_indexing_op_" + index.Name;
                 //put temp val in cache which is used as a rudimentary way to know when the indexing is done
                 AppCaches.RuntimeCache.Insert(cacheKey, () => "tempValue", TimeSpan.FromMinutes(5));
diff --git a/src/Umbraco.Web/PublishedCache/NuCache/PublishedSnapshotService.cs b/src/Umbraco.Web/PublishedCache/NuCache/PublishedSnapshotService.cs
index 6866878484..7e78b2e96f 100755
--- a/src/Umbraco.Web/PublishedCache/NuCache/PublishedSnapshotService.cs
+++ b/src/Umbraco.Web/PublishedCache/NuCache/PublishedSnapshotService.cs
@@ -859,7 +859,7 @@ namespace Umbraco.Web.PublishedCache.NuCache
             Notify<IContentType>(_contentStore, payloads, RefreshContentTypesLocked);
             Notify<IMediaType>(_mediaStore, payloads, RefreshMediaTypesLocked);
 
-            if (_publishedModelFactory.IsLiveFactory())
+            if (_publishedModelFactory.IsLiveFactoryEnabled())
             {
                 //In the case of Pure Live - we actually need to refresh all of the content and the media
                 //see https://github.com/umbraco/Umbraco-CMS/issues/5671
diff --git a/src/Umbraco.Web/PublishedCache/PublishedSnapshotServiceBase.cs b/src/Umbraco.Web/PublishedCache/PublishedSnapshotServiceBase.cs
index 20d3e6d8e3..1b56f54569 100644
--- a/src/Umbraco.Web/PublishedCache/PublishedSnapshotServiceBase.cs
+++ b/src/Umbraco.Web/PublishedCache/PublishedSnapshotServiceBase.cs
@@ -1,11 +1,12 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using Umbraco.Core.Models.Membership;
 using Umbraco.Core.Models.PublishedContent;
 using Umbraco.Web.Cache;
 
 namespace Umbraco.Web.PublishedCache
 {
-    abstract class PublishedSnapshotServiceBase : IPublishedSnapshotService
+    internal abstract class PublishedSnapshotServiceBase : IPublishedSnapshotService
     {
         protected PublishedSnapshotServiceBase(IPublishedSnapshotAccessor publishedSnapshotAccessor, IVariationContextAccessor variationContextAccessor)
         {