diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 3b1dfb6..a40bb85 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SfrCreate.cpp b/SfrCreate.cpp
index 8ea21b8..cf9e4f7 100644
--- a/SfrCreate.cpp
+++ b/SfrCreate.cpp
@@ -172,11 +172,23 @@ GetSurfFlatRegionFromFatCurve( ICurve* pCrv, double dRadius, bool bSquareEnds, b
       if ( IsNull( pCompo2)  ||  ! pCompo2->Invert())
          return nullptr ;
      // offset della prima curva a destra del raggio
-      if ( ! pCompo1->SimpleOffset( dRadius, nOffsType))
+      OffsetCurve OffsCrv1 ;
+      if ( ! OffsCrv1.Make( pCompo1, dRadius, nOffsType))
          return nullptr ;
+      ICurve* pOffs1 = OffsCrv1.GetLongerCurve() ;
+      if ( pOffs1 != nullptr) {
+         pCompo1->Clear() ;
+         pCompo1->AddCurve( pOffs1) ;
+      }
      // offset della seconda curva a destra del raggio
-      if ( ! pCompo2->SimpleOffset( dRadius, nOffsType))
+      OffsetCurve OffsCrv2 ;
+      if ( ! OffsCrv2.Make( pCompo2, dRadius, nOffsType))
          return nullptr ;
+      ICurve* pOffs2 = OffsCrv2.GetLongerCurve() ;
+      if ( pOffs2 != nullptr) {
+         pCompo2->Clear() ;
+         pCompo2->AddCurve( pOffs2) ;
+      }
      // se estremi squadrati
       if ( bSquareEnds) {
         // aggiungo alla prima curva una linea che la unisca alla seconda