I recently rebuilt a Delta 40-560 scroll saw that I picked-up really cheap.
It needed a really good cleaning & the upper & lower arm bushings were pretty worn.

Original condition,
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I completely disassembled the scroll saw & cleaned it all up! I replaced the upper & lower arm bushings & also needed to repair the mounting/thread locations for the pivot posts.
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The finished scroll saw works really good now & the previous vibration is gone now.
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Next thing on my list was a custom stand & a small air compressor, Since the original small bellows style air pump that was originally on the scroll saw was not worth replacing. Even replacing it with a new larger style bellows wouldn't have helped that much.

Doug