Hello Crumpet

Yes, there is a link ... (see below).

Assembly is straight forward but with a couple of notes:
- the RH bearing housing is slotted.
- the important bit is re-assembly ... alignment and lube.
- only light oil on the pawl carriers.
- light grease on the axle and drum bearings.

The last thing you want on re-assembly is miss-alignment.
If you have a sticking pawl you need to have private health insurance.

Mod BB has given an excellent run-down of the issues:-

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/77975/SB45_Rear_Drum_Assy_-_Bearing_.html

Hope this helps.
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Jack