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The fit is exactly right on the tailstock—the screw sits snug and the scale ring doesn't wobble anymore. Took about five minutes to swap out, and now the feed screw holds position perfectly during cuts.

The replacement retainer slid right into place on the tailstock and locked the feed screw down with zero wobble. I was worried about the scale ring shifting during a job, but it stays perfectly snug now.

The bracket aligns perfectly with the existing holes on my SC4 tailstock, and the scale ring now sits snugly without any wobble. It holds the feed screw steady, which resolved the play I was having with the original setup.