This is classic old school. Folks used to repair things to keep them going. They would even "hard face" bars with a special welding rod & acetylene torch to rebuild the hard nose bar tip & worn down bar rails. Now, everything is disposable.
How much ya want for that machine, ha! Not nearly as cool, but a metal cut off blade chucked up in a tablesaw works for removing any burrs and for grinding the edge square. Might be a good idea to first take the sawdust out of the bottom of the tablesaw to not burn your shop down.
i have a disc sander machine with a table that would do the same basic thing . for that matter you put a bar in a bench vice and grind the rails flat by hand , ive done it .