woo black rims! what pads are you using btw? That tensioner seems to look fine to me, i use the same one (and looks the same, with the hole there and nothing being there) and the hole only needs a small bolt (usually a pin off a pedal) when you are running the chain 'up'. If its down then its fine as the metal bit is resting on the lower part. I dont know if im making any sense btw JK