Hello Matt w
the pred spur is made from delrin which is another type of bearing material such as ptfe...and also the nut tightens onto 3 coned washers which act as a spring(on other cars eg losi,asso) which is the same princible used in some losi diffs
maybe having the coned washers installed incorrectly is causing this weird spur problem
i think the correct orrientation is as below.....
SLIPPER NUT.....WASHER
<......WASHER
>........WASHER
<......CLUTCH PLATE
hope this makes sense