The wooden formers that I gave to John a while back came originally from Ron Mainprize, of Hull, via John Thompson, and I understand that they were really intended to be patterns to get cast metal items made, rather than being used directly. If metal formers were made from them I think that a lever-operated grooved roller could be attached quite easily, that would form the double-curvature of the rear end of the chainguard onto the sheet metal ‘blank’, in a similar fashion to a plumber’s pipe-bending machine. I think that components from such a machine could be used to construct the tooling, especially the grooved rollers and linkages.
Brian
