roller rockers adjustable
 

looked intoasetof highlift quick open cranes. seem cool
i need to replace studes, guide plates etc.
the factory non adjustable set up, is it using some sort of press in stud to hold together things now? i am asking if i need to drill and tap the holesto install the crane stuff. if so, i need to remove the head. wondering if its just a bolt together install. would be if threads are tapped now.
thanks curious