also back in the day, used to take chain off [first linking in some old chain
to pull over countershaft sprocket for easy re-install] then heating it up
in [used] oil in a pan over a small fire [like a campfire], hanging it up
to drain, then re-installing and adjusting carefully..
[saw my dad doing same as a boy]
then one day i got a nice new american made o-ring chain,
[and sprockets] which, with obsessive alignments/adjusting,
lasted forever [on cb750sohc/4]...
today they almost maintain themselves