diff --git a/Profiles/WinLib/WinCalculate.lua b/Profiles/WinLib/WinCalculate.lua
index 0562310..c7ab79b 100644
--- a/Profiles/WinLib/WinCalculate.lua
+++ b/Profiles/WinLib/WinCalculate.lua
@@ -1118,8 +1118,8 @@ local function AddStartDowels( nOutlineId, nPrevOutlineId, nProfileLayerId, nDow
          EgtTransform( nDowelId, frOrig, GDB_RT.GLOB)
          EgtTransform( nDowelId, frDest, GDB_RT.GLOB)
          EgtMove( nDowelId, dStart * vtRef)
-         EgtModifyCurveExtrusion( nDowelId, vtRef)
-         EgtModifyCurveThickness( nDowelId, dEnd - dStart)
+         EgtModifyCurveExtrusion( nDowelId, - vtRef)
+         EgtModifyCurveThickness( nDowelId, - ( dEnd - dStart))
          -- setto info di lavorazione
          EgtSetInfo( nDowelId, WIN_PRC_FEATURE_TYPE, WIN_PRC_TYPE.HOLE)
         
@@ -1192,8 +1192,8 @@ local function AddStartDowels( nOutlineId, nPrevOutlineId, nProfileLayerId, nDow
          EgtTransform( nDowelId, frOrig)
          EgtTransform( nDowelId, frDest)
          EgtMove( nDowelId, vtRef * dStart)
-         EgtModifyCurveExtrusion( nDowelId, vtRef)
-         EgtModifyCurveThickness( nDowelId, dEnd - dStart)
+         EgtModifyCurveExtrusion( nDowelId, - vtRef)
+         EgtModifyCurveThickness( nDowelId, - ( dEnd - dStart))
          -- setto info di lavorazione
          EgtSetInfo( nDowelId, WIN_PRC_FEATURE_TYPE, WIN_PRC_TYPE.HOLE)
          
@@ -1258,8 +1258,8 @@ local function AddEndDowels( nOutlineId, nEndOutlineId, nProfileLayerId, nDowelL
          EgtTransform( nDowelId, frOrig)
          EgtTransform( nDowelId, frDest)
          EgtMove( nDowelId, - vtRef * dStart)
-         EgtModifyCurveExtrusion( nDowelId, - vtRef)
-         EgtModifyCurveThickness( nDowelId, dEnd - dStart)
+         EgtModifyCurveExtrusion( nDowelId, vtRef)
+         EgtModifyCurveThickness( nDowelId, - ( dEnd - dStart))
          -- setto info di lavorazione
          EgtSetInfo( nDowelId, WIN_PRC_FEATURE_TYPE, WIN_PRC_TYPE.HOLE)
          
@@ -1331,8 +1331,8 @@ local function AddEndDowels( nOutlineId, nEndOutlineId, nProfileLayerId, nDowelL
          EgtTransform( nDowelId, frOrig, GDB_RT.GLOB)
          EgtTransform( nDowelId, frDest, GDB_RT.GLOB)
          EgtMove( nDowelId, - vtRef * dStart)
-         EgtModifyCurveExtrusion( nDowelId, - vtRef)
-         EgtModifyCurveThickness( nDowelId, dEnd - dStart)
+         EgtModifyCurveExtrusion( nDowelId, vtRef)
+         EgtModifyCurveThickness( nDowelId, - ( dEnd - dStart))
          -- setto info di lavorazione
          EgtSetInfo( nDowelId, WIN_PRC_FEATURE_TYPE, WIN_PRC_TYPE.HOLE)
          
@@ -1447,8 +1447,8 @@ local function CalSplitDowel( nSplitLayerId, nOutlineId, nProfileType, nPartId)
       
       -- posiziono il dowel e gli assegno estrusione e spessore
       EgtMove( nDowelId, vtDowelDir * dStart)
-      EgtModifyCurveExtrusion( nDowelId, vtDowelDir)
-      EgtModifyCurveThickness( nDowelId, dEnd - dStart)
+      EgtModifyCurveExtrusion( nDowelId, - vtDowelDir)
+      EgtModifyCurveThickness( nDowelId, - ( dEnd - dStart))
       -- setto info di lavorazione
       EgtSetInfo( nDowelId, WIN_PRC_FEATURE_TYPE, WIN_PRC_TYPE.HOLE)