I’ve writ up a new repair blog called Treating Rust with Phosphoric Acid. It features dangerous chemicals and, as such, is very exciting.
One of the bigger projects we have in the workshop is a Burns Vista-Sonic from the early 60s. Alongside a number of other issues, it has badly rusted metal parts: particularly bridge saddles and bridge plate. Because these parts are very hard to find we’re forced to make do with the old ones… and they’ll do the job well once we treat the rust.
There are a number of ways to tackle rust,