And here is a link to the A7A10 forum, an excellent source of technical information and general advice on these bikes.
The BSA A7-A10 Forum - Index
www.a7a10.net
My knowledge is pretty limited as my Super Rocket came to me in running and 90% restored condition. The power unit, trans and primary had all been professionally rebuilt with lots of new parts used.
I've replaced some cosmetic items and added the 2 leading shoe brake. Also replaced the rear brake, added new Leighton seat, new monobloc carb, 12volt charging system, Siamese exhaust and repaired the magneto with a Brightspark Easycap.
But as far as internal engine or trans work, I've been lucky as that was all in great shape already, no need to mess with it.
So I'm of little or no help there.
Glen