BSA Bantom manuals.
Dr. S ... They DID write a Haynes Manual for the Bantam.
While I've got your attention, you might want to visit this site and download everything for your "do not delete" archive. You never know, you might actually find one and want to restore it someday.
Before you pooh-pooh that, my Wife found a Yamaha DT-1 for me to restore for her ... I had no idea, but she had wanted one in the early '70's, when her brothers were racing Hodakas and Bultacos. Hers showed up at a garage sale here in Sonoma ... A roller with non-seized motor & trans, and not one but two parts bikes, all of which had been stored out of the weather since the late 1980s.
I say above that I was going to restore it for her (in her mind), but I managed to convince her to do most of the work herself. Was fun, if occasionally frustrating for both of us ... but today she can troubleshoot fuel or wiring problems, replace the clutch or rebuild the carb, do the brakes or repair a puncture, etc. with no help. Recommended!