I have just completed top end job and everthing went together fine except the bolt that threads into the cam chain tensioner. It threads into the tensioner fine for about 3/4's of the way in after that it turns really hard and I am concerned that I may damage something if I turn it in any further. I double checked that the tensioner rod was released by turning the tensioner rod counter-clockwise. I was wondering if I was using the correct length of screw or maybe used the correct screw somewhere else? The length of screw I am using is .520". Does anyone know the correct length for the cam chain tensioner bolt? Thanks for any help!