Adjusting the Backcheck Distance on a Grand Piano

One of the steps in the regulation process of a grand piano is to adjust where the backchecks are adjusted to so that the hammers checks at the right distance from the string to aid in fast repetition of the keys.  The following video talks about and shows the process of how to make this adjustment.  Here is a link to the Wire Bending Pliers we talk about in this video: Piano Wire Bending Pliers