My new ds2500 pads arrived today so I took the wheel off to have a quick look at the caliper, then noticed the **** will spin on the hub. there is no locater screw in it. No matter how I turned the disk so that the holes line up with the five holes on the hub (went round about five times checking) there is no place for the locater screw! Is this normal? The disks are genuine Audi & have the badge on them. Why have a hole for a locater screw if you don't fit one?