diff --git a/LuaLibs/WallExec.lua b/LuaLibs/WallExec.lua
index 81360a3..6fd50ce 100644
--- a/LuaLibs/WallExec.lua
+++ b/LuaLibs/WallExec.lua
@@ -907,15 +907,17 @@ local function SetMirroredOperations()
    local vMillings = {}
 
    -- raccolgo le fresature non già fatte in doppio
-   local nOperId = EgtGetNextOperation( EgtGetPhaseDisposition( 1))
-   while nOperId do
-      EgtSetCurrMachining( nOperId)
-      local sUserNotes = EgtGetMachiningParam( MCH_MP.USERNOTES)
-      local bIsDouble = ( EgtGetValInNotes( sUserNotes, 'DOUBLE', 'i') or 0) > 0
-      if not bIsDouble and EgtGetOperationType( nOperId) == MCH_OY.MILLING then
-         table.insert( vMillings, nOperId)
+   if WD.DOUBLE_HEAD_MILLCORNER then
+      local nOperId = EgtGetNextOperation( EgtGetPhaseDisposition( 1))
+      while nOperId do
+         EgtSetCurrMachining( nOperId)
+         local sUserNotes = EgtGetMachiningParam( MCH_MP.USERNOTES)
+         local bIsDouble = ( EgtGetValInNotes( sUserNotes, 'DOUBLE', 'i') or 0) > 0
+         if not bIsDouble and EgtGetOperationType( nOperId) == MCH_OY.MILLING then
+            table.insert( vMillings, nOperId)
+         end
+         nOperId = EgtGetNextOperation( nOperId)
       end
-      nOperId = EgtGetNextOperation( nOperId)
    end
 
    -- ordinamento delle operazioni raccolte secondo X e poi Y crescente