Dapol 57xx gears spares?

[Kris]

I have a poorly 57xx from Dapol. Having stripped it down it is apparent that the gear between the motor worm drive and the wheel set gearing has worn away. No idea how this happened as it did so before the loco came into my possession.

Is there a source of spare gears rather than having to purchase a whole rolling chassis? Neither Peters Spares or DCC models have any gears for this model.