Another comment in regards to the tensioner - this is applicable to when I replaced the chain/tensioner in the 300D. Upon close inspection of the tensioner "spring" you could see where the edge in about the middle section had been rubbing against the side of the tensioner housing. The spring was about rubbed in half of it diameter thickness in this area. Look for flat spots on the tensioner spring.
Unfortunately, I did not get any pictures of it.