Getting that machine up and running is pretty easy. Correct me if I’m wrong but I do believe that is a 541. As far as the handle fork goes, my advice would be to find someone who welds pot metal. I had a 700 that had some broken spots in it and I had a friend who welded pot metal so it wasn’t hard to get it fixed. If the bag has no holes in it if say soak it in the tub and use it. Service on these, I’d say either the cord has been replaced or it’s in really good condition for original, these require the top bearing to be lubricated with oil and lower bearing greased all of which is a simple but delicate task if you know how to service electric motors, also as far as brushes go I’m sure they’d be at least half capacity due to these being a very low RPM motor. If it’s a good deal go for it. Although not my cup of tea to use daily it would definitely clean up extremely well and be a great conversation piece.