Originally Posted by jellyghost
Newbie question. What do you use to drill the holes? Drill press or hand drill?
Drill press. I will be not using common hand drill... but with Dremel and small sintered carbides milling cutter it should be perhaps O.K.
Biggest problem has been with cleaning of the exit edges / splinters from the drilling inside, especially in middle of the barrel. I have presed trought 17,4mm (11/16") ball bearing to separate them from the barrel and then very fine sandpaper (granularity 800) on wooden pencil to clean the finish. Then I have flex-honned the barrel again.