Ugh bracket help

summerdays

Cycling in the sun
Location
Bristol
I've got the Ugh brackets to hold my lock on my pannier, however it is continually slipping, and needing me to tighten the fixing bolts. (And yes I did get hubby to do it last time incase it was slipping due to my feeble efforts.) Does anyone have a suggestion of how to make the bolt grip the pannier rack better?
 
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