I am working on getting a 1976 Ford Courier up and running. One of the rocker arms is missing this part (circled in yellow in the following pictures), and that rocker arm destroyed the camshaft and cannot be adjusted without this missing part. I ordered new rocker arms, and they are also missing this part. The part is the nut that goes on the end of the bolt that runs through the rocker arm.
In the first image, the rocker arm on the right has this part (circled in yellow). The rocker arm on the left does not have this part.
https://goo.gl/photos/FrDPvfCcmax1BY4f8
This is another view of the missing part.
https://goo.gl/photos/Xk69kkppoeQyXyY7A
In the first image, the rocker arm on the right has this part (circled in yellow). The rocker arm on the left does not have this part.
https://goo.gl/photos/FrDPvfCcmax1BY4f8
This is another view of the missing part.
https://goo.gl/photos/Xk69kkppoeQyXyY7A