Thanks Paul! I have also made my own drill stops as I required them. I agree with you to drill the hole with the same drill you going to use. Done mine on the metal lathe. I all so like the idea of having threaded holes on both sides (did not think about it) What metal did you use? I have made my from round bar Aluminum but found the setscrews strips the threads on the bigger drill bits from over tightening to prevent the stops from moving. I think by tightening from both sides will solve this. Like the paper washers.