I have one here, and a b4 spur. The b4 spur is a bit thicker (about 1mm) but is a LOT more flexible. Not sure if the teeth can be made wider? clearance? but I still think if it was made like the b4 spur it would stand up better.
The gears are good - so if something is gonna slip or break (and the slipper is too tight) then the spur is the weakest point.
If you could make the slipper as easy and nice to adjust as the one on the 501X - then I think you'd never have a problem again. That car has several turns just to adjust to your preference.
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