No damage yet, but it seems to be trying to run into the wall. Like little thread like strings are visible around that edge. The rubber and and teeth are all perfect. It has about 1/16 from the outside, and 1/8 from the inside. SO i can see the metal reflecting when the engine runs on the outside.

Ive taken the car for a 100km drive, revved to 5000rpm on the spot and no issues. Just those strings are bothering me. Am i doing something wrong with the tension?

I looked at my old belt and it looks perfect after 94000 km.
Thats why its troubling me. I think the tensioner is the only thing at fault, because im not sure on the setting.

Is there a fool proof way of adjusting the tension? Any pics of it being done?

Thanks for all of the help guys. Your advice has helped me a lot.