The trick is to stack washers between a strong grade bolt and the pin. You add washers so the bolt doesn't bottom inside the pin, or in the case of the M103, it doesn't go through since the far end is open. Turn the bolt and it extracts the pin. The washers need a strong surface to resist them. In the M103, the washers would bear on the plastic guide rail and probably crack it so I had to find something to use as a bridge so the solid surface of the head resists the washers.