is there not a Knobster database here with pix of knobs for reference?
me: there should be
my manager: well Mr. Grinx, i see a chance for you to add more value to the corporation
me: meh
P.S. a pic with a quarter next to them for reference might help, or some other esoteric sizing reference...
EDIT:
(for the database)
a pic of the knob
the unit it came from
the part #
would be swell