When you've installed a pin it often creates a slightly tight link. If you turn the tool over to the other side, and use the upper part of the cradle you can push the pin back ever-so-slightly in the opposite direction to the way you installed it and it frees it up:
Re-using pins isn't a great idea, as it can take off the slight 'mushroom' cap. Though it won't be a problem on most track chains - I push the pin nearly out, remove links and then push it back in so that at least one side hasn't been capped. With e.g. 10sp chain I would always use a brand new fastening pin like this.
When you've installed a pin it often creates a slightly tight link. If you turn the tool over to the other side, and use the upper part of the cradle you can push the pin back ever-so-slightly in the opposite direction to the way you installed it and it frees it up:
Re-using pins isn't a great idea, as it can take off the slight 'mushroom' cap. Though it won't be a problem on most track chains - I push the pin nearly out, remove links and then push it back in so that at least one side hasn't been capped. With e.g. 10sp chain I would always use a brand new fastening pin like this.