Yep, the tool Digger shows will do on either side. I do both sides at same time and loosen the left tensioner with a small flat blade screw driver and then clamp it like Fred shows. I am not so sure that de-tensioning is really necessary.
2002 Black Standard Brakes "TE MEGA MONTY"
"Well, Chester; choos'n friends goes kinda fast once the shoot'n starts." Mathew Dillon to Chester Goode