Arena 90 clippers crank head problem?

[palomino698]

Old clippers which worked in the past, had them serviced last winter but didn't clip after all.

Assembled them to use this week and they won't work - the crank head (? - I think that's the term) spins up and jams the blades within seconds of switching them on. I don't have an instruction book but I'm fairly sure the crank head just screws onto its mounting. Am I missing something obvious, before I send them back to where they were serviced? Too little oil? Fitting it too loosely or too tight? Facing the wrong way? Should there be another part, that's absent? I'd really like a photo of the head, without blades, so I can see if mine look wrong!

Thanks.

(Also posted in Stable Yard)

 

[palomino698]

Bump...

These are the older Liveryman Arena 90 clippers - surely someone else has them? The part coming loose is the thing that screws into place in the middle of the head, and I don't know why it's not staying in place!

Thanks in anticipation.