If possible, I would file out the cracks using Jewelers Files. FYI, this sort of cracking is commonplace with #8 or larger dimples. Install a doubler if desired. My RV guru, Jody Edwards, [professional aircraft mechanic, A&P IA] told me that the best way to avoid those cracks was to use a drill, two sizes larger than recommended [ie for a #8 screw, drill a #17 hole, rather than a #19] I've since followed that advice and have had no more cracking issues when dimpling large holes.
Charlie
Last edited by chaskuss : 12-10-2012 at 10:13 PM.
Reason: clarified
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