Russell Hobbs mini chopper - needs repair (Winkfield Row RG42)

Please see second photo - teeth have been stripped from the intermediary gear in the motor unit. It is straightforward to dismantle, but I've not found the part available. If you can fabricate or replace the part it could be working again. Otherwise the other parts could be useful as spares. This contains a blade assembly, so over 18s only and won't be left outside for collection.