not that i have done it but i just got a freshly fragged piece. wherever you would cut, try and make sure the head can retract as far as possible. one of mine got cut close it seems and isnt coming out all the way yet but it is living. the cut on the top of the piece was as close to the top polyp as it could be. you may be able to see it in the fd thread pic but if not i can get a pic when i come back this afternoon.