Thanks heaps for the information I’ll check it out. I’m also hoping someone here has restored this model and has some idea if it’s sheared or there was a different style of key used. One again thanks for the help.About the closest thing you’re going to get resembling a parts breakdown are product brochures on the Vintage Machinery website. At the back of each brochure there’s a replacement parts list with graphic representations of each part
According to the Lathes UK website never any operator, parts, or repair manuals published.
I think as dirty tool said, it could be a safeguard to keep the gear or acme thread from shearing.Glad you found the information you needed Do you think the key was some kind of “ safety “ to protect the gear ?