I've got 3 aluminium discs, 400mm diameter, 2mm thick, with a 12mm hole in the centre.
They look as though they ought to be useful for something, and seemed too good to go in the scrap skip - a small turntable base maybe?
Possibly for a G1 or G0 acquaintance, if they are too small for G3?
I'll be going to the AGM, so could deliver to you there.
Any takers?
Andy