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And these are the before and after pictures of the cast metal frame. I used deoxit and an old cloth and cotton buds to remove the dirt and cover the metal at the same time with the deoxit, which usually gives a very thin coating that will protect the metal. Smells horribly though. :)
I think I will need to lube the top and bottom ball bearings of the spindle. The top one I can reach easily. For the bottom one I probably have to unmount the flywheel, but I don't want to...