I mushroomed out the head of a taper pin on a S&W sport that wouldn't budge and ended up 1) grinding the end of the taper pin flat 2) dimpling it with a center punch and 3) putting it in the freezer for an hour to get the metal to contract. After that I was able to get a punch with a 3/16" shaft that tapers to 1/16" with a flat end into the dimple and a firm whack drove it out on the first hit. I spent the better half of an afternoon trying to brute force that pin out before giving up and trying less taxing methods, which ultimately won the day.