Had one of these today and realised there are no reference images on the internet for this module – so here are some reference images of a complete tear down.
I have circled things to note and look for, small thrust washers, a spring, and a push fit wheel on the driving wheel. The push fit wheel comes apart quite easily from the slot it sits in and needs to be removed to be completely dismantled.
You follow these images and notes at your own risk and I bear no responsibility – also apologies for WordPress throwing the images out of sync
Cumbria Watch Repair 