Timenut111,
The stake you have is a star punch ?
Can also be called a triangular point punch. It is used to close the hole in rollers by raising burrs around the edge of the hole.
If you have this one,..then I believe you will want to raise the burrs on the "bottom" of the roller, so that it will "bite" onto the should of the staff better.
If it is a single roller, you'll want to be careful of the impulse pin. You may have a stump that will accommodate that as well.
I did this a couple of years ago on one that was loose. You want to go very carefully at it. It shouldn't take much to close it sufficiently. If you make it too tight,...you risk damaging it when pressing it back on ( or the staff !! ). If you do make it a bit too tight, you'll have to broach it out a bit and keep trying for the best (snug) fit.
I've cracked a roller by getting too heavy handed
Bob..tell me if I missed anything...I'm been away from my bench too long LOL !!!
Randy