From what I’ve been able to find, anything new is not compatible with the old. I am Leary of buying a used one off of eBay for double of a new style, being you never know how long it will last. There is a few YouTube videos of guys that have converted foot to hand control. They do not show how, but they show finished results so it can be done. A hand control would be fine by me so I’m researching the potentiometer and rocker switch with the wiring schematic.