The Clevis? thing must have threads in opposite directions on each end , chain attached with bolts from valve cover in to top cover holes , turn thumb screw at other end till it catches and pushes down , once tight it will stay in place as long as needed ,while you measure and make your changes as needed .... once you make yours up the light in brain comes on and you think , why didn’t I think of that , simple to figure out how to use , if you made it that far into servicing you can make it work ...