Hi Norm & MF,
Both these new ones the SPFC and the PT have the 2 ribs. The SPFC base is perfect but the PT base which had been converted to FC is rusted completely out. Just different circumstances I think and care in use. The PT base had been converted to take a SPFC with an adapter that looks like it was made from a sundercut disc without an oxy cutter too.. Very heavy, thick and rusty. But it would have worked I guess. Sorry MF no photos. I might try to borrow the wife's smart phone to see if I can. Unfortunately there has been some disassembly.
All the best
Jeff
