I've replaced my Makita HP331D for a HP333D - Why? - YouTube
Amazon.com: Replacement Part for M.C Motor Gearbox Housing Switch Clamping Chuck Head for Makita DF331D HP331D Accessories Shell Box Electric Screwdriver - (Type: Motor) : Tools & Home Improvement
Makita HP331D 10.8 Volt Cxt Li-ion Combi Drill Spare Parts - Part Shop Direct