This is definitly not rocket science---BUT--If, like me you occasionally need a variable speed rotary power source, don't overlook your common 3/8" variable speed drill. A couple of pieces of wood screwed together with a drill body size cut-out between them, and a threaded rod or long bolt (tap the hole in the wood to suit). I even added a fancy knurled knob to mine, simply because I already had it left over from another project. It works great!!! Screw the threaded rod in or out against the drill trigger, and you can turn the drill off or turn it on and screw the bolt in until you reach the speed range you desire. Most of these drills have a reverse as well. This is probably the lowest tech tip you will see this year.---Brian
