A fine day at the range

[Nuclearcricket]

Yep, and it sucks when you over stroke and it pops out, can be a real pain to get back in. Those barrel laps are nice for just doing a bore or a hole. Also you can have several the same size and use them for different grits of compound. The little piece you see in the front of the lap is a tapered plug that screws in and is used to expand the lap. That part as well as the shank are reusable. I have a couple of those laps left over from my work days and do use them on occasion. Lapping compound is up to you. Mostly I have used Clover brand but I just can't for the life of me ever seem to remember which it is that is is that breaks down and becomes finer as you use it. I do know one type of grit has very sharp edges and the other is kind of round in shape. The round will break down and give progressively finer abrasive and thus a finer finish. I do know for a really fine finish go to a diamond compound. It will not cut all that fast but work it long enough and you can get up to a mirror finish.
Sam