Nah that pin can be replaced with a bolt. Sounds like it rusted to the perch. You'll just need to go to the hardware store and find a high grade bolt with that same diameter head on it and bolt together your leaf springs with it. You might try some Penetrating oil, pb blaster or some wd40 on that piece still in the perch. I'd maybe try drilling it out. Not sure if there is room in there to hit it with a punch and it just stay in there, but it's possible that there is.