I love this story, prob because it’s got all the stuff I find interesting: tanks, a member of the former Soviet bloc (or not so former in this case lol) and tinkering.

http://www.bbc.com/future/story/20180312-the-salvagers-who-raise-world-war-two-tanks-from-the-dead

So, chainset compatibility is not a new problem:

““You take the idle sprocket front jockey wheel from a T-34 launched in 1942 to put it on the model launched in 1941. But it doesn’t match,” says Vladimir.”