Genuine Makita part 233920-5 — "Ring Spring 11" (small ring spring/circlip) designed to secure the spindle/cam assembly inside the gear housing of Makita hammer drills. It’s the compact ring-type spring listed as “Ring Spring 11” (nominal 11 mm) and installs in the groove around the spindle to hold the cam/gear components in place. The part appears in Makita parts diagrams for HP2050 / HP2051 and HP2070/HP2071 , so it’s a direct-fit replacement for those models.
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