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Hi Mark, I used one of these -
http://www.ebay.co.uk/itm/24mm-Wirewound-4W-Power-Potentiometer-10K-Ohms-/121658656600?
I converted my 80s CB to an expression pedal but gave up in the end. Managed to get extra treadle travel to get the full range of the pot but at one extreme the rack would sometimes pop off the pinion. There's so many CBs though you may well have better luck then me.
Did wonder if a 15 or 20k pot would've worked as zero could be set and be all secure, no popping off etc, and maybe the max resistance the pot got to, say 12k or whatever, wouldn't matter as the Pitchfork wanted to see 10k. That might be a daft theory.. and I never tried it.