Shims really help slop in axles, gearboxes, gears, and wheels, especially in the vintage and rere (re-release) Grasshopper, Hornet, Grasshopper II, and Super Hornet. But do you know where to place them to get the maximum gear mesh and preventing axles from popping out of the gears in the gearbox? In this episode of the RC Deep Dive podcast we shift you into this higher gear answer.