Well, bike is back from service (finally) and I was just about to go on a ride when I noticed one of the rear brake blocks is rubbing slightly on the wheel at one point in the wheel turn. Took the wheel out to see if maybe it wasn't in completely straight, but that doesn't seem to be the problem, the brake block is just too close to the rim. Don't want it to rub all weekend, and bike shop not open again till Monday, so I have to do it myself. Just can't work out which screw I need to turn, is it that tiny screw on the arm? Which way do I turn it? Or do I have to do something completely different? What does the one on the brake lever on the bars do? Am looking at the bike book, but it's not very clear (they are v-brakes by the way), please help, so I can still go on a ride tonight!!!!