It uses two #12-24 flat head machine screws as the 'pins' and a Craftsman #4, 8" Phillips screwdriver as the handle. (Any long phillips screwdriver will do as long as the shaft is round and 3/8" in diameter.) The holes are designed so that the screws need to self-tap themselves as you screw them in, for the tightest possible fit. The screwdriver is also a tight fit, and should slide in the full length of the Carpokes name. It's tight, so you really need to work it in or even tap it lightly to get it fully seated.
Once assembled, it works just like the $160+ factory tool. I printed this one in ABS (100% infill) and it easily holds the 33 ft lbs spec. I tested it up to 50 ft lbs and decided not to push it further. That said, if you have a stuck bolt to undo, might be best to print in a carbon-fiber filament.
