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Not really a Thor problem, but an overall design deficiency. Many units travel without any cap separation, but lots have the problem...1/32" sheet metal just does not have enough thickness to keep the screw threads engaged, thus many of them back out. If you have the problem, you can actually see the cap move in the rear-view mirror as you travel. Needs backing of some sort for the screws to tighten to.
I had Rolling Retreats work on mine--looked/worked well for maybe a 1000 miles of movement, then one screw on each side began backing out again. Used JB Weld on the screw threads, seemed to hold. But traded it off for a MH before enough traveling to see if it was permanent.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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Threaded Mode
