When I replaced mine they went right in with maybe a love tap or two from a ball peen hammer. Since they are close I would think a small bit of grinding would be the best course. You don't want to heat or do anything too drastic with forged or heat treated pieces.
That's my concern. When I hung them the first time (backwards) they did slip right in, and also out when I disassembled them. I'm pretty confused why it's a tight fit now. Maybe the metal expanded from the very cold winter to the tepid spring.
