The post & pin doesn't have to be removed to be re-zeroed. Just use the tool to fully depress the pin to spin the entire post, then use the tool to depress the top notch, which allows the blade only to spin and be aligned. The post has two sets of notches, one is perm attached to the post, which adjusts zero. The other set of notches is on the blade spinner and allows the blade to be repositioned.