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They will fill a hole as long as they aren't too loose. The rivet tries to bend over if it doesn't expand quick enough. If a hole is too loose, I weld it up & redrill it. Rivet buck tail protrusion can not be more than one and one half the diameter of the rivet shank or they try to nail over. On a tight hole a person can use a little bit shorter buck tail but no less than one diameter of protrusion.
It's a PITA to buy them long and cut them down but it insures the correct length every time.