Locate and Release Belt Tension

What happens here

The presenter positions himself safely under the equipment to gain access to the drive belt mechanism. He identifies the belt tensioner, which is secured by a small pin. Using needle-nose pliers, he carefully reaches into the confined space to pull out this tension pin. Releasing the pin disengages the tensioner pulley, slackening the old belt and allowing for its removal and subsequent installation of the new belt.

Goal: Loosen the drive belt for removal.