So a friend was switching out the alternator on my 2007 Camry SE (v4) and the tension bolt thing snapped off while putting things back together.. he was able to get the belt back on and tightened from under the car (car was on a lift). At this point it's all together and from what I've read online it seems like replacing the belt tensioner is quite a process. Is it a big deal to just leave it as is? I'm not sure how big of a deal it is being that he was able to do it from under the car. I took a photo..

 

If this is the tensioner bolt for the alt it should be easy enough to replace.

The tensioner for the other belt is more difficult.

If the alt belt is tensioned OK and two bolts holding the alt to the bracket are tight, it should be fine.

 

Yes it's for the alt belt; that's what I was thinking too. Thank you for the reassurance. I think we'll just leave it and maybe replace it when changing out belt next time