jim s-w wrote:They are used for cutting the bevel onto mounts used in picture framing. A supplier who deals in this sort of thing will have one (such as Lions in Birmingham but they also crop up on Ebay.
Also on p88 of the Atlantis Art Supplies catalogue.
This is a supplier that I use a lot, as they seem to have all manner of useful tool, paints and materials. And it's only twenty minutes walk from work at lunchtime