You just use a drill and tap. There are two different size holes in the JGRO build:
10-24 - use a #25 drill bit and 10-24NC tap
1/4"-20 - use a 13/64" drill bit and a 1/4"-20NC tap
If you don't have the drills or a tap and die set, you can buy the individual size taps you need and they'll come with the appropriate sized drill bits in a pack for only a couple of bucks each. |