On Tuesday, July 24, 2018 at 2:54:18 AM UTC-5, firstname.lastname@example.org wrote:
Many of the female sockets have a bump-out as part of the material the bade
pushes against, and that helps hold the plug into the socket. It is much
easier for a manufacturer to make a complete through-hole in the plug eleme
nts than to just try to make a partial indent that will engage the bump-out
of the socket. For sockets that do not have an integral bump-out, the hol
es have no appreciable effect..
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