Hi there...
How long have you had your pedal? Might be a good idea just to have it rebuilt...EB will do it for a given price, depending on the type of pedal, + s/h to them, and they send it back to you. They will replace whatever needs to be (incl. the string!), and short of the outer casing, it's a brand new pedal. The inside of it looks like a monster just waiting to get out of its cage, so I personally wouldn't try it without adult supervision. ;-)
If you'd prefer just to do it yourself, it's probably something that you just really grab at a crafts or hobby store (maybe?), or even your local guitar shop could hook you up...just some suggestions, take them with a grain of salt.
I'm actually heading towards the rebuilding direction myself...when I step on my pedal all the way, I get a buzzing until I back off of it a tad, then it's groovy.
Just my $0.02...
Darrell
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From the link:
http://www.ernieball.com/products_pedals.php
Volume Pedal Repair Information
Q. Can I get my volume pedal rebuilt? What is involved? What is the cost?
A. Yes. We replace the potentiometer, string & spring kit, the feet, jacks, matting, bushings, virtually everything except the outer casing. We even clean it up for you. Then we thoroughly test your pedal to insure that it is working properly..
The cost is:
Mono pedal (#6166) - $45
Stereo pedal (#6165) - $65
Stereo 25k Pedal (#6167) - $55
Mono Switch Pedal (#6168) - $55
You must prepay with a money order, bank check, or credit card - NO PERSONAL CHECKS PLEASE - U.S. Funds only. Prices subject to change.
You pay shipping to us, we pay shipping back to you. We recommend you ship it UPS.
Ship your Pedal to:
Ernie Ball, Inc.
Volume Pedal Rebuilds
151 Suburban Road
San Luis Obispo, CA 93401