In the mean time, I got a Casio foot pedal for a musical inst like elec piano or guitar or something or other. One of the guys put up a mod someone else did to adapt it to the harbor freight 130 TIG... the post by Parkour and his link.
http://www.mg42.us/viewtopic.php?f=10&t=7208&start=0
Internally it has a toothed lever that engages a gear that steps up to a larger gear that turns the POT. The pedal movement is short and turns, thru gearing, the POT 7/8 rotation. The Everlast POT turns 3/4 rotation so there's plenty of room to adjust for full movement. All I have to do is make a bracket to mount the toothed lever/foot pedal to pivot on and a bracket to hold the POT and one to hold the gear shaft. The only thing is the gears turn the Casio POT counter clockwise so I'll have to flip the Pot.
The neat thing, the gears are the same pattern as a sewing machine belt so I can do a mod like acourtjester did if need be.
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