Might want to dress up the hex and check for burrs. Take some Emory and lightly clean the inner surfaces. Do the same on the bar hex. Throughly wipe out the inside of the hex. Use a good high pressure grease and attempt to install. Usea dead blow to tap it in.
Probably not but if early a bodies have that thick washer under the nut of the pivot pin u didnt accidentally leave it on the shoulder and not under the nut? Maybe?
