A Dremel with a round, longish (Don't know the proper nomenclature) grinding bit. Sort of looks like a piece of 3/16" dowel mounted on a shaft--and a lot of care and patience. Or, if you don't have a Dremel, a small file will serve the same purpose. Just grind/file the end of the pin down to the washer and carefully push/tap it out with a 1/6" pin drift or an old 1/6" in drill bit.