This plate I made with pressboard, duct tape, 40 grit sandpaper and some dried chanterelles.
after I managed to relocate my pancake I found various bacterial colonies along with some maggots had taken up residence. this we rectified by applying heat and then liberal amounts of varnish.pancake drying before going back between to boards so that it flattened out again.
here are the plates. The Pancake and a piece of mat board with aluminum tape, a washer and some plastic mesh that once contained marbles i melted to the board using a torch.