This drill jig lines up the drill with the trimmer and holds the drill centered.
This is a prototype made out of scrap so the pieces aren't all the right length.
I built this to convert 2500 9 X 19 nickel brass to 9 X 18 Makarov
You will have to determin how fast to run your drill in relation to how sharp your cutter is
**WARNING wear eye protection, this can throw shavings a good distance**
*NOTE* You need to keep the drill running until you after you retract the cutter
to keep the socket from slipping off the nuts.