I have a powered Vandercook Universal I that I was considering converting to a hand-crank. On the operator side there is a stub with two threaded holes with set screws. I wanted to design a handle adapter that could be attached to the stub via the two threaded holes, so I first carefully measured them with a precision flexible ruler. I got an angle of 89.15°, but in order to get a more accurate measurement that could be then transferred to the adapter, I designed this checker. The angles between each pair of holes range from 89° to 90.25° by .25° increments. The checker fits onto the stub and the closest match to the existing holes can be identified by attaching set screws through the checker. The angle can be determined by the notch on the checker, but the flanges also allow the measurements to be transferred to a handle adapter directly.
