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anyone else having trouble with the customizer? It seems there is a ASCII/UTF-8 conversion problem (maybe the (C) symbol.)
(OpenSCAD file works fine)

I printed one of the stock ones and it looks great! Going to tweak for some 1" nails I have a bunch of.

As others suggested, I spread some hot inside the "broom hole" to provide a grippy surface and prevent slipping. Worked great.