You don't need to buy the $30 tool, here is what I used to change the belt in my '98 S70, took me about 20 min. It is very very easy.
The tip on the ratchet is a 11mm crowsfoot (sold at Sears for about $4) and the rachet most people already have... insert the crowsfoot end into the tensioner and it gives you great leverage.
Once the tensioner is pulled forwards, the allen wrench fits into the little hole at the top of the tensioner and the block behind it, keeping it forward (released) while you remove and replace the belt!
Here's my post with the steps I took
http://www.brickboard.com/AWD/index.htm?id=954283&show_all=1
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