diff --git a/Common-PF1250.mlpe b/Common-PF1250.mlpe
index 1ccfdbb..3b4f5a5 100644
--- a/Common-PF1250.mlpe
+++ b/Common-PF1250.mlpe
@@ -514,26 +514,6 @@ function OnSimulToolSelect( dPosA)
       local nInd = EgtIf( nSetHead ~= 2, 1001, 1011)
       AddToolToCollisionObj( EMT.TOOL, EMT.HEAD, EMT.EXIT, nInd, true)
       AddToolHolderToCollisionObj( EMT.TOOL, EMT.HEAD, EMT.EXIT, nInd + 1)
-
-      if nSetHead ~= 1 and ( EMT.PREVTOOL_H1 and EMT.PREVHEAD_H1) then
-         local nPrevExit_H1 = 1
-         local nInd_H1 = 1001
-         AddToolToCollisionObj( EMT.PREVTOOL_H1, EMT.PREVHEAD_H1, nPrevExit_H1, nInd_H1, false)
-         AddToolHolderToCollisionObj( EMT.PREVTOOL_H1, EMT.PREVHEAD_H1, nPrevExit_H1, nInd_H1 + 1)
-      end
-      if nSetHead ~= 2 and ( EMT.PREVTOOL_H2 and EMT.PREVHEAD_H2) then
-         local nPrevExit_H2 = 1
-         local nInd_H2 = 1011
-         AddToolToCollisionObj( EMT.PREVTOOL_H2, EMT.PREVHEAD_H2, nPrevExit_H2, nInd_H2, false)
-         AddToolHolderToCollisionObj( EMT.PREVTOOL_H2, EMT.PREVHEAD_H2, nPrevExit_H2, nInd_H2 + 1)
-      end
-      if nSetHead ~= 3 and EgtGetHeadId( 'H31') then
-         local nPrevExit_H3 = 1
-         local nInd_H3 = 1001
-         AddToolToCollisionObj( nil, 'H31', nPrevExit_H3, 1001)
-         AddToolHolderToCollisionObj( nil, 'H31', nPrevExit_H3, 1002)
-      end
-
       for i, Coll in ipairs( EMT.COLLOBJ or {}) do
          EmtAddCollisionObjEx( i, Coll.Fr, Coll.Ty, Coll.Mv, Coll.P1, Coll.P2, Coll.P3)
       end
@@ -746,6 +726,27 @@ function OnSimulMachiningStart()
          EmtSetLastError( 1211, 'Missing or not active double tool of '..sOldTool)
       end
       EgtTdbSetCurrTool( sOldTool)
+   else
+      -- recupero il gruppo
+      local nSetHead = GetHeadSet( EMT.HEAD)
+      if nSetHead ~= 1 and ( EMT.PREVTOOL_H1 and EMT.PREVHEAD_H1) then
+         local nPrevExit_H1 = 1
+         local nInd_H1 = 1001
+         AddToolToCollisionObj( EMT.PREVTOOL_H1, EMT.PREVHEAD_H1, nPrevExit_H1, nInd_H1, true)
+         AddToolHolderToCollisionObj( EMT.PREVTOOL_H1, EMT.PREVHEAD_H1, nPrevExit_H1, nInd_H1 + 1)
+      end
+      if nSetHead ~= 2 and ( EMT.PREVTOOL_H2 and EMT.PREVHEAD_H2) then
+         local nPrevExit_H2 = 1
+         local nInd_H2 = 1011
+         AddToolToCollisionObj( EMT.PREVTOOL_H2, EMT.PREVHEAD_H2, nPrevExit_H2, nInd_H2, true)
+         AddToolHolderToCollisionObj( EMT.PREVTOOL_H2, EMT.PREVHEAD_H2, nPrevExit_H2, nInd_H2 + 1)
+      end
+      if nSetHead ~= 3 and EgtGetHeadId( 'H31') then
+         local nPrevExit_H3 = 1
+         local nInd_H3 = 1001
+         AddToolToCollisionObj( nil, 'H31', nPrevExit_H3, 1001)
+         AddToolHolderToCollisionObj( nil, 'H31', nPrevExit_H3, 1002)
+      end
    end
    -- se precedente in doppio ma ora solo testa 1 e non in sicurezza
    if EMT.DOU_TO_ZMAX then
diff --git a/Common-PF1250.mlse b/Common-PF1250.mlse
index 64970fd..28f7204 100644
--- a/Common-PF1250.mlse
+++ b/Common-PF1250.mlse
@@ -574,7 +574,11 @@ function OnPostApplyMachining()
 
    -- Verifico flag di separazione e fase di scarico
    local sNotes = EgtGetMachiningParam( MCH_MP.USERNOTES)
-   local bPreSplit = ( false and sNotes:find( 'Presplit', 1, true) ~= nil)
+
+   -- bPreSplit sempre a falso per obbligare a pinzare il pezzo con 1 morsa anche se iniziato il taglio che dividerà grezzo e finito (in genere per sezioni grandi con 2 tagli di lama)
+   -- Tra un taglio e l'altro infatti c'e' inversione del braccio e quindi un'apertura delle rulliere. Se pinzano entrambe le pinze, potrebbero esserci problemi di collisone rulli-morse
+   local bPreSplit = false --( sNotes:find( 'Presplit', 1, true) ~= nil)
+
    local bSplitting = ( sNotes:find( 'Split', 1, true) ~= nil)
    local bPreCut = ( sNotes:find( 'Precut', 1, true) ~= nil)
    local bCutting = ( sNotes:find( 'Cut', 1, true) ~= nil)
diff --git a/Essetre-PF1250.mlde b/Essetre-PF1250.mlde
index 59f85c0..2af08da 100644
--- a/Essetre-PF1250.mlde
+++ b/Essetre-PF1250.mlde
@@ -70,12 +70,13 @@
 -- 2024/07/08 ver 2.6g1 Allineamento con common ver. 2.6g1
 -- 2024/07/12 ver 2.6g2 Allineamento con common ver. 2.6g2
 -- 2024/07/22 ver 2.6g3 Allineamento con common ver. 2.6g3
+-- 2024/07/23 ver 2.6g4 Allineamento con common ver. 2.6g4
 
 -- Intestazioni
 require( 'EmtGenerator')
 EgtEnableDebug( false)
 
-PP_VER = '2.6g3'
+PP_VER = '2.6g4'
 MIN_MACH_VER = '2.5k1'
 MACH_NAME = 'Essetre-PF1250'
 
diff --git a/MachNotes.ini b/MachNotes.ini
new file mode 100644
index 0000000..5f58449
--- /dev/null
+++ b/MachNotes.ini
@@ -0,0 +1,50 @@
+; Commento per evitare BOM con UTF-8
+;Index = Type, Description, Default Value
+; Type : b=boolean, d=double, l=lenght, s=string
+
+[Drilling]
+
+[Sawing]
+
+[Milling]
+0=d,MaxElev,0
+1=d,OutRaw,0
+2=d,SideElev,0
+3=d,TrimExt,0
+4=sr,VtFaceUse,0,0,0
+
+[Pocketing]
+0=d,MaxElev,0
+1=b,Open,0
+2=d,OpenMinSave,0
+3=d,OpenOutRaw,0
+4=d,MaxOptSize,0
+
+[Mortising]
+0=d,MaxElev,0
+
+[Chiseling]
+
+[SawRoughing]
+
+[SawFinishing]
+
+[GenMachining]
+0=l,LinTol,0.1
+1=l,MaxLen,2
+2=s,Type,ZigZag
+3=d,SideAng,90
+4=l,Step,10
+5=l,OffsProj,0
+6=l,LiTang,0
+7=l,LiOrth,0
+8=l,LiElev,0
+9=l,LoTang,0
+10=l,LoOrth,0
+11=l,LoElev,0
+12=b,DirFromGuide,1
+
+[SurfRoughing]
+
+[SurfFinishing]
+0=b,SkipMaxDown,1
diff --git a/ToolNotes.ini b/ToolNotes.ini
new file mode 100644
index 0000000..0d2c1ef
--- /dev/null
+++ b/ToolNotes.ini
@@ -0,0 +1,41 @@
+; Commento per evitare BOM con UTF-8
+; Index, Type, Description, Value
+; Index = 0,1,..,n
+; Type : d=double, l=lenght, s=string, b=boolean, dr=double recalc, sr= string recalc, lr=lenght recalc, br=boolean recalc, th=toolholder
+; Description : STEP, SIDESTEP, ...
+
+[DRILL_STD]
+0=th,TH,
+1=d,STEP
+2=s,DOUBLE
+
+[SAW_STD]
+0=th,TH,
+1=d,STEP
+2=d,SIDESTEP
+3=b,LONGCUT
+
+[SAW_FLAT]
+0=th,TH,
+1=d,STEP
+2=d,SIDESTEP
+3=b,LONGCUT
+
+[MILL_STD]
+0=th,TH,
+1=d,STEP
+2=d,SIDESTEP
+3=d,SIDEDEPTH
+4=s,DOUBLE
+
+[MILL_NOTIP]
+0=th,TH,
+1=d,STEP
+2=d,SIDESTEP
+3=d,SIDEDEPTH
+4=s,DOUBLE
+
+[MORTISE_STD]
+0=b,MORTISE
+1=d,STEP
+2=d,SIDESTEP
diff --git a/UpdateLog.txt b/UpdateLog.txt
index 0843ce2..7c6d37f 100644
--- a/UpdateLog.txt
+++ b/UpdateLog.txt
@@ -1,5 +1,8 @@
            ==== Common_PF1250 Update Log ====
 
+Versione 2.6g4 (23/07/2024)
+- (SIM) Corretta ultima modifica per controllo collisioni testa non utilizzata. Trovava collisioni in lavorazioni in doppio.
+
 Versione 2.6g3 (22/07/2024)
 - (SIM) Si aggiunge al controllo collisioni anche Tool e ToolHolder della testa non utilizzata. Ticket#1937
 - (SIM-GEN) In caso di grezzo piuttosto piccolo, concesso pinzaggio fino al massimo possibile, oltre al calcolo con coefficienti. Ticket#1942
diff --git a/Version.lua b/Version.lua
index 8eb6635..9c60142 100644
--- a/Version.lua
+++ b/Version.lua
@@ -3,7 +3,7 @@
 
 local InfoCommon_STD_PP = {
    NAME = 'Common_PF1250',            -- nome script PP standard
-   VERSION = '2.6g3',                 -- versione script
+   VERSION = '2.6g4',                 -- versione script
    MIN_MACH_VER_PP_COMMON = '2.5k1'   -- versione minima kernel
 }