diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 8d1671a885..d1d8736062 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -46,7 +46,7 @@ using System.Threading;
 using log4net;
 using Nini.Config;
 using Nwc.XmlRpc;
-using BclExtras;
+// using BclExtras;
 using OpenMetaverse;
 using OpenMetaverse.StructuredData;
 using Amib.Threading;
@@ -1375,8 +1375,29 @@ namespace OpenSim.Framework
         /// <summary>
         /// Created to work around a limitation in Mono with nested delegates
         /// </summary>
-        private class FireAndForgetWrapper
+        private sealed class FireAndForgetWrapper
         {
+            private static volatile FireAndForgetWrapper instance;
+            private static object syncRoot = new Object();
+
+            public static FireAndForgetWrapper Instance {
+                get {
+
+                    if (instance == null)
+                    {
+                        lock (syncRoot)
+                        {
+                            if (instance == null)
+                            {
+                                instance = new FireAndForgetWrapper();
+                            }
+                        }
+                    }
+
+                    return instance;
+                }
+            }
+
             public void FireAndForget(System.Threading.WaitCallback callback)
             {
                 callback.BeginInvoke(null, EndFireAndForget, callback);
@@ -1445,7 +1466,7 @@ namespace OpenSim.Framework
                     ThreadPool.QueueUserWorkItem(callback, obj);
                     break;
                 case FireAndForgetMethod.BeginInvoke:
-                    FireAndForgetWrapper wrapper = Singleton.GetInstance<FireAndForgetWrapper>();
+                    FireAndForgetWrapper wrapper = FireAndForgetWrapper.Instance;
                     wrapper.FireAndForget(callback, obj);
                     break;
                 case FireAndForgetMethod.SmartThreadPool:
diff --git a/bin/BclExtras35.dll b/bin/BclExtras35.dll
deleted file mode 100644
index 7a7480a3a1..0000000000
Binary files a/bin/BclExtras35.dll and /dev/null differ
diff --git a/prebuild.xml b/prebuild.xml
index 48bb2d3f48..854149b3f6 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -158,7 +158,6 @@
       <Reference name="System.Data"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>
-      <Reference name="BclExtras35" path="../../bin/"/>
       <Reference name="OpenMetaverseTypes" path="../../bin/"/>
       <Reference name="OpenMetaverse" path="../../bin/"/>
       <Reference name="OpenMetaverse.StructuredData" path="../../bin/"/>
@@ -1597,7 +1596,6 @@
       <Reference name="OpenSim.Region.ClientStack"/>
       <Reference name="OpenSim.Region.Physics.Manager"/>
       <Reference name="OpenSim.Services.Interfaces"/>
-      <Reference name="BclExtras35" path="../../../../bin/"/>
       <Reference name="XMLRPC" path="../../../../bin/"/>
       <Reference name="Nini" path="../../../../bin/"/>
       <Reference name="log4net" path="../../../../bin/"/>