so I can look down between the pipes and see the gap in the tensioner at any time. It was a little tricky figuring out where to put the hole but to me it was worth it. I started to hear some noise one time and able to see that the gap in the tensioner was completely closed up just by looking through the hole. Ended up being that the arm on the tensioner had seized up and I was able to find it before having any other problems like jumping teeth.