Ya lost one this summer, same deal, well greased. Was several hours from home so I jury rigged a bolt & cut a spare nylon/teflon 5er pin/hitch plate to size using a small hand saw, then drilled a hole in centre and installed a bolt & plate on spring. Got us home no issues, then ordered a full extra set in case it happens again. I did use loctite blue when installing the nut on the new bolt.. Don't know if it will help but can't hurt.
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