I'm planning to replace the serpentine belt, tensioner, and idlers as necessary on my B7 S4. I've been through the whole service position thing with an A6 C5 V8 a few years ago, so that's not too daunting. But.. I've read that the tensioner on the S4 is manually adjusted, rather than the usual spring loaded type that was on my A6 and a few other cars where I've done this job. Is that the case, and is there a spring loaded version available?