Okay, here is replacement spring for the Curtis PB style pot box. With more and more low quality parts are being used in pot boxes, especially the imports, the pot boxes are failing prematurely. Rebuild your pot box with quality components and save maintenance issues later on!
A common problem now, the springs are of low quality and tend to lose there ability to return to their uncompressed state... this means your accelerator pedal may not turn all the way off!!! Replace that weak or ben spring now. These are beefier springs and specifically designed so that they cannot be over compressed. Available in both "piano wire" steel and also stainless steel. These are built here in our shop.