Yesterday I noticed that when my belt is on my tensioner doesn't work. When I took the belt off and tried it the pulley moved up and down. I'm thinking the threads may be stripped. Has anyone ever had this happen? I am about to get one at the dealer but it's $80 and just thought I would ask. Thanks in advance.

 

Does anyone have one of these laying around that they might want to sell? Sorry if I'm not supposed to ask this question here, mods move or delete if you feel necessary.