diff --git a/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs b/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
index bde548b..650e7db 100644
--- a/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
+++ b/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
@@ -14,14 +14,13 @@ namespace StructureHelperCommon.Models.Forces
         public void Update(IForceTuple targetObject, IForceTuple sourceObject)
         {
             if (ReferenceEquals(targetObject, sourceObject)) { return; }
-            CheckObject.IsNull(targetObject, ": target object ");
-            CheckObject.IsNull(sourceObject, ": source object ");
+            CheckObject.CompareTypes(targetObject, sourceObject);
 
             targetObject.Mx = sourceObject.Mx;
             targetObject.My = sourceObject.My;
-            targetObject.Nz = targetObject.Nz;
-            targetObject.Qx = targetObject.Qx;
-            targetObject.Qy = targetObject.Qy;
+            targetObject.Nz = sourceObject.Nz;
+            targetObject.Qx = sourceObject.Qx;
+            targetObject.Qy = sourceObject.Qy;
             targetObject.Mz = sourceObject.Mz;
         }
     }
diff --git a/StructureHelperCommon/Models/Forces/StrainTuple.cs b/StructureHelperCommon/Models/Forces/StrainTuple.cs
index 930c864..40ba0fd 100644
--- a/StructureHelperCommon/Models/Forces/StrainTuple.cs
+++ b/StructureHelperCommon/Models/Forces/StrainTuple.cs
@@ -1,10 +1,12 @@
-using StructureHelperCommon.Services.Forces;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Services.Forces;
 
 namespace StructureHelperCommon.Models.Forces
 {
     /// <inheritdoc/>
     public class StrainTuple : IForceTuple
     {
+        private readonly IUpdateStrategy<IForceTuple> updateStrategy = new ForceTupleUpdateStrategy();
         /// <inheritdoc/>
         public double Mx { get; set; }
         /// <inheritdoc/>
@@ -21,8 +23,9 @@ namespace StructureHelperCommon.Models.Forces
         /// <inheritdoc/>
         public object Clone()
         {
-            StrainTuple forceTuple = new StrainTuple() { Mx = Mx, My = My, Nz = Nz, Qx = Qx, Qy = Qy, Mz = Mz };
-            return forceTuple;
+            var newItem = new StrainTuple();
+            updateStrategy.Update(newItem, this);
+            return newItem;
         }
         public static StrainTuple operator +(StrainTuple first) => first;
         public static StrainTuple operator +(StrainTuple first, ForceTuple second)