One time I was riding my Tomos and the throttle cable snapped at the point where it goes into the throttle on the handle bar, since there was no way to manually pull on throttle with just your fingers, used my *edc tool *leatherman squirt to grab one end of the cable and wrap it a few times around the tool which made the use of throttle doable, worked fine for a short trip.
*edc = every day carry
*leatherman squirt = tiny quality plier multitool (edited)