Originally Posted by mblab
Spent rifle casings work well for hole punches.
Maybe a bit OT, but spent casings have some other values, too... modern-day Keihin carburetors do not have flathead idle mix screws - they are 'D' shaped. You can buy that expensive ass tool, or flatten one side of a .223 case and use it. I don't have a pic of mine, but one lives in the tool pouch of one of my bikes.