I have now built 2 of these .
The first one i had that problem with the std slipper and did as you did and melted the spur.To cure this i fitted a std Durango spur with AE HD slipper pads and that was 2 months ago and no problems since.
The 2nd car was built 3 weeks ago for my son and it worked fine all stock gear and no problems.
Just make sure you take your time as i found it a bit puzzling at first as its quite different to anything else i have built.
Sorry i can`t be of more help !
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