How do you free up track tensioner on mt52 bobcat?

How do you repair rubber track on a bobcat MT52?

In between the track carriage there is a brass plate with a 3/8 bolt holding it and a large hex head in the center of it. Making sure you have the track off the ground remove the 3/8 bolt and remove the plate. Use a 1 1/2 in wrench to loosen the tensioner until you can remove or put track on. Use the step down on the plate to measure the proper tension.