[sdiy] Reproductions of Vintage Synth Parts (how are they made?)

[Ken Elhardt]

I'm wondering how it appears so easy for the Technology Transplant guy
on ebay to make reproductions of vintage synth knobs, buttons,
switches and so on.  I was under the impression that getting some
custom plastic part fabricated from scratch was expensive, but he's
got all kinds of stuff.  Does anybody know the process a private
individual would have to go through to make a reproduction of a
Jupiter-8 knob in quantity for example?  Are the costs reasonable?

Just a few examples of stuff he offers below.  I'm tempted to buy his
reproductions over new boring stuff from Mouser/Digikey.  And his
prices aren't bad compared to new designs either.

http://cgi.ebay.com/NEW-roland-tr-808-drum-machine-FULL-6pc-repro-KNOB-SET_W0QQitemZ290270514764QQ
http://cgi.ebay.com/roland-tr-808-FULL-16-step-SWITCH-SET-new-repro_W0QQitemZ300265526000QQihZ020QQ
http://cgi.ebay.com/roland-JP-4-Jupiter-4-SLIDER-KNOB-set-NEW-repro-parts_W0QQitemZ290271267202QQ

-Elhardt