Well I ended up buying a starter box instead. I was done with yanking that pull start, so I decided to go big.
I got the Ofna 1/10 "true-start" universal box.
I still have a problem though.
Either the flywheel hole in the chassis is too small, or the flywheel doesn't stick down far enough. The rubber wheel on the starter box just barely touches the flywheel, but it makes contact with the sides of the chassis at the same time. What can I do? I can't see cutting the chassis, so my only other option is to use a smaller rubber wheel on the starter box. Has anyone else had this problem??