I had the same problem. I modified mine to be through bolted just like the rock guards. I drilled out the rivets that attached the rubber mount on the 1/4 turn mounts. Slipped in a machine screw. Put a washer and nut to hold the machine screw. Removed the 1/4 turn screw. Reriveted the mounts put the rock guard back on and put a locknut on to hold the rock guard. This modification has been working perfectly for 35,000 miles.
Here are pictures of how I did this modification http://www.airforums.com/forums/f42/...ml#post1996232
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2021 Northern-Lite 10-2 & F350 DRW PSD, 600W Solar/Victron/600A BattleBorn
146 nights 31,000 miles (first 10 months!)
Sold: 2018 GT27Q, 74 nights 12,777 miles
Sold: 2017 FC25FB, 316 nights 40,150 miles
Sold: 2013 Casita SD17 89 nights 16,200 miles
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