I need a new chain grinder for a KLR 600 out of 85. The existing one is broken like glass (hardened) replacement would cost 80-90 euros, a third of the whole motorcycle. I think about making something like that with the swingarm as a “form” itself, e.g. from a tough epoxy resin glue, which is mixed with tixotrophic agents. I still have both. Does anyone have an idea how to start this ? The old grinder is unsuitable as a form, crumbled.