I made a cast with cerrosafe this morning.

It doesn't help that it is slightly sprung and needs tweeked to make the halves line up.

bottom band = .674
groove = from .598 to .612

http://www.ebay.co.uk/itm/150741776147?s...9#ht_614wt_1185

here's the photos on ebay. I can't get them in a format to upload.