Ever had a tool or piece of equipment that works so well you take it for granted? I have owned my FlexArm tapping ( http://www.flexarminc.com/index.html ) arm since the early 2000's, and it amazes me every time I use it still. Just tapped 38 different holes with a 1/2"-13 thread through 1/2" mild steel in under 10 minutes. Yup, under 10 minutes. The only real downside to this tool is it's air consumption, which is pretty healthy at just over a constant 13 CFM. Check out this short video of it in action!