Dave;
I found the invoice. The dop pot is called Rock Rascal Mod. D. The
replacement copper pot is $10.00 I think. I purchased it from Lortone
Inc., 2856N.W. Market St., Seattle, Washington 98107-4297
phone # (206) 789-3100 fax # (206) 789-3102, best wishes,John Barton