I'm no expert but I think that's a pin that could be pushed out the other side with a drift, it goes thru the pedal arm and the crank shaft. They come in all sizes and lengths. After it's out the pedal arm should slide off. Make sure it will come out spray it with some PB Blaster. Good Luck. After your resto is done put the pedal arm back on, line up the holes and tap in the new pin (or the old one if you got it out in one piece). If the new pin is to long cut it off to match the old one before you tap it in. A cut off wheel works good because they are hard steel.