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@gbj_tester
It's possible that it needs a French lockring. It's not at all easy to tell by measuring, as the sizes are close, ISO/JIS is 32.76mm nominal thread OD, French is 33.00mm. Pitch is also close, so it's hard to be sure with only a few turns to measure, 1.00mm for French and 1.06mm for ISO/JIS. Although they seem close enough to be interchangeable, using the wrong one could be contributing to your loosening issue.