If cutting with a slitting disc on the dremel. Wear the disc right down till its only maybe 5-8mm across. this will allow you to work in a tighter area. Bits of duct tape stuck in strategic places incase of slippage.
Trick is to mark a thin line and to very carefully follow it. No rush, here success is the result needed so dont push it.
Trick is to mark a thin line and to very carefully follow it. No rush, here success is the result needed so dont push it.