I'd like to tap into the APUG accumulated knowledgebase...

I've always cut bevel mounts by hand with a Logan and a straight-edge, but was recently given the old board cutter shown in the attached pictures.

The person I got it from had no idea how it was used and I'm having problems working it out, never having used one myself before. It would be really useful to me at the moment as I have a whole bunch of mounts to cut for a show.

The only identifying markings are stamped on the cutter itself - Locality Arts Ltd, and a Patent number. It's pretty old, but looks serviceable.

Has anyone got one - or seen one - like this? Any advice on how to set it up for cutting would be much appreciated.