Make sure to wipe the amps down well with a prep pad and let it dry for a few before opening them...even with the opener most times you will find some broken pieces in the amp when your drawing out.
I have NEVER needed one, just applied a little pressure rotate and add pressure, rotate etc........it will generally just snap off nice and clean there seems to be an inherent weak point in them.
I have NEVER needed one, just applied a little pressure rotate and add pressure, rotate etc........it will generally just snap off nice and clean there seems to be an inherent weak point in them.