#2
Its not your standard 9mm, 16mm, 24mm pot. You need to buy a special "wah" pot generally. They run you around $10 - $30.

Or when you say size do you mean resistance?
#4
OHH when you can't seem to find that baseball thats... on ebay...

ugh horrible comercial reference... sorry

i think
http://www.smallbearelec.com got some too
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Faded Gibson SG Special - Black ice mod
Seymour Duncan SH-5 in bridge
B-52 AT 112
Ted Weber Mass100 attenuator
EHX Small Clone
EHX Metal Muff
DIY Modded tubescreamer
Dunlop 535Q Wah
Wax Potting tutorial