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Drill Size For Dimpled -4 Rivet Holes

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GESchwarz

Well-Known Member
Joined
Oct 23, 2007
Messages
1,250
Location
Ventura County, California, USofA.
I've noticed the after dimpling a #30 hole, the the diameter of the hole opens up, making for a loose fit for the -4 rivet.

Should I drill thes holes with a 1/8" or #31 or #32 drill so as to have a tighter hole and stronger attachment?
 
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