You may want to add, Fred, that to do your mod requires a 1 piece bicycle crank and not a 3 piece crank with aluminum crank arms. It may not be obvious to all.
Hi solo,
I did specify a bicycle off the dump, eh?
You'd need to visit a posher dump than mine if you wanted to find an aluminum-crank bicycle there.
OTOH, my old friend Howie Gilmour used to say that with an argon atmosphere glove box, the right filler rod and a TIG welder he could join any metallic thing to any other provided all the components had a lower melting point than tungsten.