How does 1j tensioner work?

[Kosh]

I realise that its a spring actuated tensioner but i have no idea how to actualy put the serpentine belt on. Is there a bolt that i loosen to get it on then tighten it back up or what?

[annoyingrob]

14mm socket on the bolt in the middle of the tensioner, twist clockwise. The whole tensioner arm will compress :)