Does anyone have the specs on the original 720 joystick, as far as stick length above the control panel, angle, and diameter or circumference of the circular stick travel path? The only docs I've been able to find are specs on the PCB and I don't have access to an original machine nearby. I'm planning on trying to build a spinner knob to simulate the joystick since the originals are about impossible to find or prohibitively expensive. But I would like to get the control as close to the size/angle of the original as possible. Appreciate any help!