You stated you had a machinist friend so following Jerry's advice one can turn the V belt grooves off and weld on serpentine ones. Couldn't locate pics of final version but these give the general idea. Final ones have been trouble free.

[img]https://i.postimg.cc/gL6TZvHs/IMG-4179-2.jpg[/img]

[img]https://i.postimg.cc/5QwmJpmh/IMG-4180.jpg[/img]


Evan