Until now the only way to tighten or remove the pinion bolt on a Lisi 5ive is ti hold it with a pair of pliers. Doing this can damage your pinion. Team FastEddy now offers Pinion Wrenches for the Losi Five. Made of 1/8th inch stainless steel they are up to the task or removing even the tightest of pinion bolts without damaging your gear. They also make installing your pinion bolt a snap. Offered in all the popular gear sizes.