And this is the other broken off bolt I had to deal with: The belt tensioner is marketed as non fixable replacement part. Obviously the bearing of the idler puller on it needs to be replaced. The cost for that tensioner are horrendous. I was "hammering" that bolt of the pulley with an air-ratchet... - until it broke off - and only then I saw the trap Jaguar planted there: That was a left-handed bolt!!! What the ...!? The things they do to sell the complete tensioner! Anyway, as you can see above