Today I got my Lee Valley 5/16" square hole punch. I already had these diamond cone sharpeners. For this size you use a 17/64 drill bit. So now I would like to know how you accurately CONTROL DEPTH? The instructions say to drill the hole. Then remove drill bit from drill. Then place drill bit into hole and slip the punch over the bit. Then remove bit and tap punch with hammer. They caution not to use a metal hammer. Then after striking the punch you remove it and pick the cut pieces out. They suggest a dental pick. Say What? THE THING IS ..... How do you accurately control the depth? You'll have to make a plug and will need to know how to control depth. ANY SUGGESTIONS from anyone? Also, I'm thinking maybe using a Forstner bit to give the hole a flat bottom. This was one of SplinterGroups suggestions. He also suggested controlling depth by cutting to top of punches curved sides. So..... any more suggestions anyone?
