Sorry , hadda spray another coat....
This is the tool used to rough up tires to parch, but I mated it to my cordless drill .
It has a 3/8" hole in it, I used a 5/16 carriage bolt, rounded the squares just enough to start in the bigger hole.
Put a 2" bolt in,a 1/2" nut on back so the washer and nut would pull down tight.
Grinds the heck out of bocote, wasn't hard to control,run as fast as you want. Plugged up a little, but could prob soak in mineral spirits and blow clean.
A 3" bolt might be OK for clearance.
NOT OSHA APPROVED!! Leather gloves might be OK too.... :D