To just do the job once, you don't need a proper pin punch if you have the right facilities. Find a piece of hard wire, such as silver-steel, the same diameter as the roll pin, grind the end flat and square, cut it off at a length of about 30 mm, and use it to punch out the pin. If you've got an ordinary barbeque gas torch, and you have a coil spring made from the right diameter wire, just anneal the spring, straighten the wire, cut it to length, and re-harden it. You anneal it by heating it to bright red then cooling it slowly by gradually moving the torch away. To re-harden it you heat it bright red, drop it into a cup of water, then temper it by heating it just a bit so you can see the blue oxide form on the outside, but it doesn't get even slightly red. Remember, always wear safety glasses when you use a home-made pin-punch, because if you have left it a bit too hard, it may fracture when you hit it.
