8V , i wasn't letting your question blow by about the tensioner.
I needed to D/L some pix to tinypic to post first.
I've got turtlecharged internet and it takes me a while to do anything.
First pic is borrowed from tdiclub A3 timing belt tutorial.
These tensioners are way more deluxe than our A1 A2 stuff.
Have a pre-set tension spec built into them - you line up the notch with the groove. Hold it steady and tighten.
On this car (phone camera) - it appears last guy not only overtightened it - he pegged it to the limit. sob
Belt appears to be low mileage (maybe 15-20k tops)
Hopefully not much or too much wear placed on bushings.
Will know more tomorrow.
{ EdiT } [i should have rotated this pic before posting it. it needs to be turned about 90* to the left to be closer to actual appearance in parameters]
I'll test existing setting tension as it is.
Then test it reset proper.
Then test it after new belt/tensioner/roller.
Just for more factoids.
A1 A2 is 12-13 units
Make you one of these adapters.
Its almost like its in the design for it to be converted into an adapter.
Even inside the bottom its concaved to a point like a ready-made center punching for the drill bit. I stepped up bits about 6 times from 2mm to 6.5mm then ran a tap through it.
The interior body requires no drilling/boring.