3S-GTE JDM 3rd Gen Turbo Engine Woops..alternator bolt is missing

3S-GTE JDM 3rd Gen Turbo Engine, noise, missing, alternator, bolt, explains, heard, back, happen, tightened, sworn, making, started, usual, looked, woops, tensioner, stay

So my alternator started making more noise than usual, so I looked and the tensioner bolt and stay were all missing...wtf. Oh, well, that explains the noise I heard a while back... I could have sworn I tightened it. Anyone else had this happen?