Shredded rear crown gear in B44!

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Hello Chaps

Had a great days racing today. Unfortunately after the final, I noticed that that the teeth on the rear crown gear and pinion (within the rear gearbox) had shredded. This has happened once before.

The slipper wasn't too tight, and the gears were shimmed as per manual.

Anybody else had similar issues?

Also on a side note for those using Lipo, have you benefitted from extra weight? If so, where about on the chassis have you placed it?

Thanks.