Copper sheet arrived, together with a sheet of MDF to keep it flat. I used this to make a sandwich in which the copper could be cut.       Cut the copper into 4 squares, & positioned them centrally between the two MDF pieces, drilled 4 holes through, & bolted the whole thing to a lathe faceplate. Then cut a reasonable size circle out of the copper, & then slowly increased the diameter to 92.5mm Results: I popped them (one at a time) over a liner base, & s