Under no circumstances should you buy a new one. Send this one back to Jeff at Helix Controls. Give Jeff a call and let him know you are sending it. He can fix it for much less than the cost of a new one. Look him up at www.helixcontrols.com .
I can't tell what is wrong from your description, but I think the rheostat will work fine until you can get it repaired.
Hope that helps,
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