Ive had a few teeth break like that, my first set from an original 410 lasted about a year, some after that, not as long - in my experience its either
- mesh, despite what I've been told I've found the later gearbox halves, the ones that come with the centre driveshaft pin washers on the plastic tree(from the 410r), need more spacers on the none teeth side to get the same mesh as the earlier ones.
- Centre shaft gearbox bearings worn
- Slipper too tight
or a little bit of everything above!
Good luck! - Sam
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