I did west bridgeford on Saturday 4 rounds plus final and 2 practices without any issue. The only time I've seen one let go is when the slipper assembly has been built wrong, the spur gear has a cut out for a pin on one side only, my mate put the spur the wrong way round, wrecked it within minutes.
Also spend plenty of time meshing correctly, there does seem to be a tight spot on many spurs, just spin it with your fingers for a minute until there are no tight spots, or over loose areas. Finally make sure motor is clamped down tight.
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