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Herb,
Based on the parts manual, the front left cowl has 3 different sizes, the right has one size and the rear cowls all use the same. I've switched some of the impossible ones to a size longer and they work. My guess now is that over time the backing plate has stretched, wiggled or just moved enough to require an extra millimeter or two of fastener to work properly.
For example: The rear cowls use a -2 millimeter and that worked on all but about 3 on each side in different locations. I pulled out the -2 and used extra -3 fasteners and they worked fine.
My solution has been to order a few more longer fasteners from Skybolt and go up 1 millimeter on the fasteners that wouldn't quite lock. It's not what the book says, but it's what works and I'm pretty sure what the previous owner had installed.
Thanks,
Tripp
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