Hi all

I need a bit of help

I am looking to make an arbour to mount a Parker 51 Aerometric barrel on to aid polishing.

I understand the tread is a multi start, but does anyone know what the correct size is, Thread Diameter, Pitch etc.

I did buy one from the well known Argentinian but what I received was a butchered joke, with most of the treads missing, not impressed given what he charges

Thanks in advance for any help with this