I had to change my belt on my 3.0 93 Taurus and noticed that the tension pulley was loose. I got the correct torx bit and begain to tighten it up and it won't get snug. It is like the bolt isn't long enough to catch the threads inside the hole. Is this a common problem. Do I need to get a longer bolt...Am I doing something wrong? Or...is it supposed to be loose like this?