Okay I had the same problem when I did the 12K service. Everything is easy EXCEPT!!! Relieving pressure on the timing chain. Gunsmoke directions indicate using a screwdriver to compress. Mine barely moves and I am butchering the aluminum part of the tensioner. I have tried turning engine over to relieve pressure from the pump as described but makes no difference. No. 30 drill bit is .128--a .125 drill bit is what I am trying to use. I suspect there is an easier way to compress the tensioner. I am puting enough pressure to lower the tensioner with a large screwdriver that any more may break something. I have been using the cast around the bolt for extra tension for leverage but does not appear effective. In my description, can anyone tell me what I am doing wrong?--------Thanks, Rethy