I know this is old but did you find out why the lock nuts came loose? I have only recently fitted a Terafex tie bar and on a trip over some soft sand this week found both the lock nuts had really come completely undone! I mean there was 10mm of thread between the nuts and the bar each end!. I tightened the best I could with what tools I had but after driving some corrugated roads same day I found they had loosened again! Really don’t know what’s going on?
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