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How about a Roger Mayer Red Lion Wah upgrade kit. It fit all common Wah pedals and the upgrade ist done in 5 minutes.

I used to play mine for several years until it accidentally broke.
Here's a...

Here's a clip I have recorded with my Vox V847A. It's the cheapest model they produce, but I just love it, the sweep range of the pedal is perfect.

http://www.box.net/shared/eekvbjrq4i