flat belt pulley pattern

[Rickabilly]

It would need some experimentation but maybe a vermiculite tile? I'm ad libbing now and have no idea as to the strengths or weaknesses of vermiculite as a mould component, it looks a lot like the "Ceramic plates" we used to use, but might be a whole different material, I know it is used in "Gunnable" refractory linings in liquid steel transfer tun-dishes and ladles, but on it's own?... the good thing about vermiculite is that the tiles are cheap and easy to get for the lining of combustion stoves, I bought ten tiles 6" x 12" x 1" for about £10 on Evil Bay for my little LPG furnace, The big question would be moisture and thermal expansion , but it might be a good thing to find out, as no doubt, this issue will come up again.

Regards
Rick