Originally Posted by
jimb16
During WWII those carbine were being made by whomever they could pull in off the street to do the work. I often drill holes with very tiny bits that require oil and very slow drilling with very little pressure and lots of cooling time due to the ease with which those tiny bits heat up. Drilling a tiny hole (.005 dia) through 1/2 inch of steel takes a fair amount of time if you don't want to snap off a bit or burn it up. Yes, I'm making drippers for lead shot. Slow and ease does the trick.