timing belt tensioner

I have a 1999 Subaru Legacy Outback 2.5i (engine EJ25D). I recently bought it and it's nearing 200,000 miles. I don't know whether the timing belt has been changed before. I looked at the Carfax and there are a whole bunch of things listed. The only relevant listing is "recommended maintenance...

I ordered the Aisin kit and am planning to replace the belt and tensioner tomorrow. When I hold the tensioner and one hand spin with the other it only spins about a half turn. Is this normal? There is no noise or play.

Had a timing tensioner bolt shear off in the block. Was able to extract it but having trouble finding a replacement. It’s a M10-1.25x70 bolt but I can’t seem to find the hardness of the bolt anywhere. It’s not stamped on the bolt. The local hardware store has class 8.8 and class 10.9 but no...