Thank you for stopping to read I hope I don’t or didn’t offend anyone by my little joke. Seriously I have a Traxxas Tmax that has an electric start on it meaning a motor and a wire to ignite the glow plug. Typically it comes with a wand which requires a 7.2 V battery nickel metal battery to power it my wall got damaged and broken and I don’t wanna pay that much money for a new one. I was thinking if I 3-D print me a box to put on the back to hold a 9 V battery to run wires and a push button out of what type of resistor would I need to put in line so that I don’t burn up the motor as well as my glow plug ?