[Stocker]

It's been years since I did my front springs but I don't recall the perches being notched.

If we're talking about the same thing, grinding the sleeve won't hurt a thing. Sleeve is a bit too long to fit into the hanger, so you shorten it but it should still fit tightly. You won't remove enough metal to allow the bushing itself to contact the hanger. I probably shortened the sleeve by ~1/16", maybe a bit more.