I have a 250EX and have a problem. I am having troubles with the arc at lower amps. I am using the original foot control and at lower amps the arc kind of sputters for a lack of better description. It seems to go away if I try to hold the foot control in a position with out moving the pedal. It also seems to go away at higher amps using the foot control. So it seems to me to be the potentiometer. I was speeking with Mike on Friday but he seems to be off today. My other question does this sound like it could be a hf gap issue? I don't think so but I was reading the other post's and saw where some of these machines where shipped with the gap set wrong. I also would like to change to a low profile pedal and I have a Thermal Dynamics foot control but it has a 5K ohm potentiometer. I found a 47K ohm potentiometer at Neweark however it looks like the shaft is to short. Anyone know where I can purchase the correct pot?