Don, I've been around table saws as long as your table saw is old. You mentioned a clunk in the arbor, is the arbor sliding in the bushings or are the bushings worn so the arbor moves slightly up and down? Are the bushing mounts fixed solidly to the table top? I know bushings wear because they are usually brass or copper but seldom steel because they are sacrificial. If the arbor is not damaged and it's the bushings that are worn I would look into replacing the bushing housing with a new housing that has a suitable ball bearing race in it that fits your arbor. for starters you've got Princess Auto, Canadian Tire, You 'd be surprised what you can order from Home Hardware, then you try your local bearing shops, there should be shops in your city or town, and as a last resort there is always the internet. It sounds like a bushing problem, to check it out shouldn't take more than about fifteen minutes . Remove the blade and unplug it, remove the fence and flip it upside down then start checking the arbor and arbor mount and alignment and just have fun. I'd love to own that saw, when it's good, it's good!