![Shocked :shock:](./images/smilies/icon_eek.gif)
I've had 3 break in the past year or so!
I now use the standard Alfa tensioner, but modified by welding up the oil feed stud, sealing the oil return hole and then filling the tensioner cylinder with grease so that it cannot move at all. Its essentially a good quality, fixed tensioner now. I figured that if this was good enough for the Porsche engineers when they built the 944 (without a dynamic tensioner), its good enough for me too.
I'm planning on changing the belt more often - maybe every 20K miles.
Cheers,