My bike is a 2004 with 4500 miles. The belt used to run right in the middle but like eveyone else's it seems to run on the left side now. Yesterday as I checked the tension, it was at 500 lbs. I wanted to loosen to around 450 lbs. and try to get belt back in the middle. As I loosened the slider blocks (after loosening the top two bolts that hold the each slider block of course), it didn't seem to move. I loosened them quite a bit and rode for about 5 or so minutes and my little finger gauge still showed 500#. No matter how much I loosened the adjusters, it never loosened the belt according to my gauge. What am I doing or not doing?