if you dont know radio control cars/trucks use a small engine that runs on methanol, nitro and oil. and use a glow plug not a spark plug. some of the tools that are made for them dont work very well. so i came up with this. good glow plug tool. buy 1.craftsman 1/4 extension, no 43393 2. craftsman long 8 mm socket 34622. 3. harbor freight rare earth magnets no.67488. put socket on the extension, put 4 magnets in the socket. now you have magnets to hold the glow plug in. see it was easy.