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Hi,
My wife and I did the belt on my v70 xc. The tightening thing we had was the automatic one. It was weird figuring it out before the job, when reading how to do it. It becomes clearer when actually doing it. From memory there are two motions at the same time, pulling the tensioner back and turning the spring. It is like pulling back a spring and then letting it sit against the belt and releasing it with the new pressure on.
I also fudged my marks and had the exhaust cam pulley one notch out. I used white out correction ink. I found the cogs didn't really move around during the job. Just my marks weren't quite accurate enough. I drove it for a day and the timing didn't fell very tight. It was all right, that evening reduced tension and turned the cog one notch back or forward.
Good idea to do water pump too. For me though the timing belt took a bit of energy. It was really hard to get it off at the bottom; under the crank pulley is a tight spot requiring sonambulist stuff from the belt, twisting and pushing. But it does come surprisingly. That probably beat trying to get the crank pulley off.
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