diff --git a/LuaLibs/WallExec.lua b/LuaLibs/WallExec.lua
index e0e56e9..65d3aaf 100644
--- a/LuaLibs/WallExec.lua
+++ b/LuaLibs/WallExec.lua
@@ -666,7 +666,7 @@ local function SetMirroredFeatures( vProc, b3Raw)
                   nFaceLookingFrontSide = j - 1
                end
             end
-            local dMaxDist = 100
+            local dMaxDist = 200
             if nFaceLookingFrontSide then
                local ptFaceCenter = EgtSurfTmFacetCenter( Proc.Id, nFaceLookingFrontSide, GDB_ID.ROOT)
                local dSideDist = abs( ptFaceCenter:getY() - b3Raw:getMin():getY())
@@ -781,9 +781,9 @@ local function SetMirroredFeatures( vProc, b3Raw)
       local Proc = vGroovesThrough[nCurrentGroove]
       if Proc.Flg ~= 0 then
          local b3Proc = EgtGetBBoxGlob( Proc.Id, GDB_BB.STANDARD)
-         local j = nCurrentGroove + 1
-         while j <= #vGroovesThrough do
-            local ProcMirror = vGroovesThrough[j]
+         local nCurrentMirrorGroove = nCurrentGroove + 1
+         while nCurrentMirrorGroove <= #vGroovesThrough do
+            local ProcMirror = vGroovesThrough[nCurrentMirrorGroove]
             local b3ProcMirror = EgtGetBBoxGlob( ProcMirror.Id, GDB_BB.STANDARD)
             -- feature non disattivata e diversa dala i-esima
             local bIsMirrorIdOk = ( Proc.Id ~= ProcMirror.Id and ProcMirror.Flg ~= 0)
@@ -814,12 +814,12 @@ local function SetMirroredFeatures( vProc, b3Raw)
                -- rimuovo dalla lista le groove già assegnate
                local ProcMirrorOldId = ProcMirror.Id
                table.remove( vGroovesThrough, nCurrentGroove)
-               if j > #vGroovesThrough or ( vGroovesThrough[j].Id ~= ProcMirrorOldId) then j = j - 1 end
-               table.remove( vGroovesThrough, j)
+               if nCurrentMirrorGroove > #vGroovesThrough or ( vGroovesThrough[nCurrentMirrorGroove].Id ~= ProcMirrorOldId) then nCurrentMirrorGroove = nCurrentMirrorGroove - 1 end
+               table.remove( vGroovesThrough, nCurrentMirrorGroove)
                nCurrentGroove = 0
                break
             end
-            j = j + 1
+            nCurrentMirrorGroove = nCurrentMirrorGroove + 1
          end
       end
       nCurrentGroove = nCurrentGroove + 1
@@ -830,10 +830,10 @@ local function SetMirroredFeatures( vProc, b3Raw)
    while nCurrentDrilling <= #vDrillings do
       local Proc = vDrillings[nCurrentDrilling]
       if Proc.Flg ~= 0 then
-         local j = nCurrentDrilling + 1
+         local nCurrentMirrorDrilling = nCurrentDrilling + 1
          local b3Proc = EgtGetBBoxGlob( Proc.Id, GDB_BB.STANDARD)
-         while j <= #vDrillings do
-            local ProcMirror = vDrillings[j]
+         while nCurrentMirrorDrilling <= #vDrillings do
+            local ProcMirror = vDrillings[nCurrentMirrorDrilling]
             local b3ProcMirror = EgtGetBBoxGlob( ProcMirror.Id, GDB_BB.STANDARD)
             -- feature non disattivata e diversa dala i-esima
             local bIsMirrorIdOk = ( Proc.Id ~= ProcMirror.Id and ProcMirror.Flg ~= 0)
@@ -864,12 +864,12 @@ local function SetMirroredFeatures( vProc, b3Raw)
                -- rimuovo dalla lista le groove già assegnate
                local ProcMirrorOldId = ProcMirror.Id
                table.remove( vDrillings, nCurrentDrilling)
-               if j > #vDrillings or ( vDrillings[j].Id ~= ProcMirrorOldId) then j = j - 1 end
-               table.remove( vDrillings, j)
+               if nCurrentMirrorDrilling > #vDrillings or ( vDrillings[nCurrentMirrorDrilling].Id ~= ProcMirrorOldId) then nCurrentMirrorDrilling = nCurrentMirrorDrilling - 1 end
+               table.remove( vDrillings, nCurrentMirrorDrilling)
                nCurrentDrilling = 0
                break
             end
-            j = j + 1
+            nCurrentMirrorDrilling = nCurrentMirrorDrilling + 1
          end
       end
       nCurrentDrilling = nCurrentDrilling + 1
@@ -951,7 +951,15 @@ function WallExec.ProcessFeatures()
          for j = 1, #vProc do
             local ProcMirror = vProc[j]
             if Proc.MirrorId == ProcMirror.Id then
-               table.insert( vProcToDisable, ProcMirror.Id)
+               -- per i fori l'operazione si basa sulla geometria ausiliaria
+               if Proc.TopologyLongName == 'DRILLING' then
+                  local AuxId = EgtGetInfo( ProcMirror.Id, 'AUXID', 'i') or 0
+                  if AuxId then AuxId = AuxId + ProcMirror.Id end
+                  table.insert( vProcToDisable, AuxId)
+               -- per tutte le altre lavorazioni si usa la geometria della feature
+               else
+                  table.insert( vProcToDisable, ProcMirror.Id)
+               end
             end
          end
       end