FWIW this is how headstock alignment is carried out on my now 12yo AL340, there is a thread on here from 3 or 4 years back.

Quote Originally Posted by PDW View Post
Somewhere I recall reading about so-called 'torque alignment' which I think basically came down to, the HS wasn't scrape mated to the bed and by selectively tightening the bolts you could tweak it into alignment.

Needless to say this is highly subject to problems but if it's worked for you - bonus. Don't touch it, hope it doesn't shift over time and that nothing else changes either......

PDW