Ron, others ...
If the holes in the knobs were tapped with a "normal"
(tapered) tap, the threaded hole will be of slightly less
diameter near the "bottom" (shaft) end of the hole. This
would tend to increase the likelihood of forcing the knob
to split. There isn't enough room for a tapered tap to
go far enough through the set-screw hole to produce a
straight thread. A "bottom" tap produces a straight-sided
hole even when there's not room for full travel of a tapered
tap..
Not that any of this would be useful information unless one
was installing a replacement knob and used a bottom tap
before installing.
One poster suggested using controls with shafts with flats
and push-on knobs. Unless care is used or the depth of
the hole in the knob and the length of the control shaft is
carefully controlled, the knob is likely to end up rubbing
the panel and creating rings of worn-away paint.
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
http://tinyurl.com/7lm3m5
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