Kind of changed my mind a bit on this one. I did the belts on my ST2 using the allen key method and it was never a worry. Nelly did the belts on the ST4. I'm just kinda wondering now how i would have felt at 10,500 rpm on the start/finish straight at Snetterton if one had let go? At least if you get a dealer to fit them then you can go and kick his arse if something goes wrong! (not that i ever would almost a year after they were done!)