Chaps,
Frankly, anything that tight benefits from a dab of washing up liquid,
spit is so very in-san-itary, as they say over the Pond,
It was a long time ago, but I replaced all the brass bushes in a Sherman with needle roller bearings. Rolls, minus tracks, like the world's biggest in-line skate! Book of Records stuff...smooth as silk.
Cheers
Fabrice