From:Dave Hennessey e-mail:dave-A-toyhouse.org
Subject:HD Grease Fitting taps Date:Tue Aug 30 14:06:14 2016
I just bought two taps (1 thru-hole and 1 blind-hole) for Harley grease fittings - special 1/4-32 thread.

If you ever need one, I've got 'em.