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I feel for ya mate, if they go when driving, which they mostly do, the damage is big.
idlers, tensioner bearings don't last a lifetime as they move pretty quick, faster than a wheel bearing.
When changing the timing belt, it's a must to replace these, and ONLY with genuine.
So Guys, if your belt has done 100.000 ks, change it NOW, save some real pocket pain lol.
Cheers, the ferret.