That's actually something I've never tampered with. I'm not real sure about what your talking about, but if a nail is involved, I'd replace it with a screw. I can't say mine have ever started falling off, they have seemed a little loose. I just figured the looseness feeling was because it is padded.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR