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Hmm, depends what info you are after and why. A detailed service guide is unlikely to exist, but here are some links... There are a couple of teardowns of Bettlach movements on here... https://www.watchrepairtalk.com/topic/2674-heuer-jacky-ickx-eb8420-teardown/ https://www.watchrepairtalk.com/topic/1625-17-jewel-ebauches-bettlach-8800-walk-through/ Cousins has interchange parts lists here https://www.cousinsuk.com/document/category/eb-movement-parts Or use Jules Borel, the 8123 is based on the 8120 so take a look at both links here http://cgi.julesborel.com/cgi-bin/matcgi2?begin=BET_&end=BET_&label=Calibres_Manufactured_by_BETTLACH Ranfft describes the family http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&EB_8100 S

Whilst trying to resolve a balance staff issue I came across this download in Cousins. It is by Ronda and after the movement info it goes on to list details of balance staffs and stems based on their stock lists. These give good info on balance staff and stem dimensions etc for many makes and calibers. It goes back to 1965 so useful for that old watch you may be working on. Once you get the hand of the way it all works it is easy to cross reference for a replacement item if an original is not available. Hope it can help. https://www.cousinsuk.com/document/search?SearchString=ronda

There isn't an emoticon for "Running round the room waving hands and shouting woo hoo"... but if there were imagine it was here. Ok - I'm not quite as good as it looks lol. The spring wasn't damaged, only tangled. So a little straightening of the final curve and then untangling it as it popped back into shape. The final curve still needs a little work but it's almost there. Still - I'm chuffed. Now got to get it all back together without buggering it up. ... P.s. do you like my balance tack? Cost: 1p