One of my two were too stuck to use vise grips/hammer. I drilled it out one oversize at a time...

Neatest way I know of is to drill a small hole all the way through the pin. Tap the end for a small-thread zerk (grease) fitting, and hook up your grease gun. Several thousand psi from a few pumps of the gun and it'll pop right out. I couldn't find my small zerks though, so I had to do it the hard way!

-Charles