Giorgio,
You are amazing. You are an inspiration.
I no longer have any valid excuses for not fixing something. 
Now, near the top of my “Kick the Bucket” list, is to visit Italy, and you, sometime before I go to meet with the Lord. 
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the injector is not to move, have someone a idea to get it out…
must i lift where i placed the knives?
i have tried there, but stands strong
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Hi GiorgioP.
Remove the mounting stud the you can force rotate the injector to break it free.
Use either two opposing nuts with one thin ground to remove the stud.
Or sacrifice it to toothed clamping grips and thread damaged, replace it later.
Regards
Steve Unruh