It's been years now as the job is no longer profitable to perform in all but extreme cases of unavailability, but welding and building up sprockets, idlers, rollers, chains, etc. on undercarriage used to be a good gig for me. I've done literally dozens of them.
I'd bet a guy could still do this work profitably if not rushed as so much is NLA from any sources. Pretty easy to keep an old tractor working if parts can be rebuilt to usable status. However, getting people to obligate funds to do the work after you find a party willing to do the work, is difficult.
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