It's been my experience that the cause of rods backing out (when properly tightened) is some lubricant has gotten in the rod. Until it is cleaned and dried out there will continue to be some loosening up of the rod. Use a good spray degrease product and a Dills pipe cleaner to wipe out the cavity. Make sure it is good and dry before reassembly.

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H Richard
SWCA1967 SWHF244