SL;
Thanks for pix!...now I've got it! ...I guess if the pin was worn, damaged or even lost, it could be replaced by a (hardened) bolt of appropriate size, with nut, but knowing that joint must allow the connection to pivot, you can't tighten the nut fully...so it should clearly have been a self-locking nut, tightened to just before contact. ...more creative and wrong engineering by a PO...but at least not too difficult to find and rectify!
Cheers
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