Hi.
I have found and purchased a small quantity of unused old stock ball and socket joints, as used to connect the positive-stop mechanism to the gearchange bellcrank arm on footchange gearboxes, and also on the bottom end of the operating rod on late type handchange gearboxes. They are threaded 1/4″BSF on both the male and female threads. Please refer to Members’ Area for details of price, etc..
Brian