The internal bushing broke on this part when the wood ruff key was over tightened or something. I made a replacement in Cad figured id upload it here to help people in the same situation. (note the provided photos show a prior version with a thinner outer wall for to support the shaft changed from 1" in diameter to 1.15" also tightened up the inner diameter from .78" to .76" should still with the shaft just less play).

replaces PCS-025 unfortunately will not work with the wood ruff key as its missing the embedded lead bushing the original has.

parts manual: https://www.sawstop.com/wp-content/uploads/2021/10/Parts_Lists_PCS_300.pdf

If you lost the Wood Ruff key its dimensions are 3/16" thick by 3/4th" diameter. source https://www.lumberjocks.com/threads/woodruff-key-install-help.94090/?post_id=1076110&nested_view=1&sortby=oldest#post-1076110