I had issues with getting speed correct on my LP12 using the Lingo 1, the belt fouled the guide and I couldn't get it up to speed, no issue with the standard LP12 belt. Mike sent me a couple of other belts to try and I found the 167.5 but 1.2mm thicker belt to work. Could reach both 33 and 45 with adjustment and belt runs on crown of the motor pulley, it is very stable when running and quiet. It definitely sounds better that the standard LP12 belt, better instrument detail and separation, strange but true, I did back to back comparisons swapping between the Blue and standard belt and it was certainly better. The blue belt run about 3% slower than the LP12 belt so needed adjusting. For £25 I am very happy with it. Mike is a nice guy to deal with, honest and trustworthy with good customer support, it was good of him to give me a few options to try when the first one wasn't successful for me, I returned the ones back I didn't need and kept the 1.2mm belt, very happy with it. I know others have not had the issues I had, my motor is new ish and I don't overtighten the adjusting screws, I don't have a Radikal so it relies on the tilt of the motor. I suppose all LP12's have their slight differences, mine is a 1983 one which has had may upgrades so a bit of a Frankenstein one really, all Linn parts though, not alternative ones.