I think what could have happened is the ball has corroded to the pin and the movement in the remote has pulled the pin and ball from the plastic socket. - To rectify all the issues I think you will need to remove the remote.
Hi, The pin in the gearbox selector rod is parallel sided. The ball you can see is part of the Nylon bush that goes in the remote selector socket, if you can see it that high then it's come up out of the Nylon bush probably due to wear. If the 8 bushes and crush tubes are worn or missing that allows the remote to sit lower and make it more obvious.
Edit: oops I missed that we'd started a second page And darkspeed has shown it.
This is for anyone in the future, who may have similar symptoms to what i was having.
So i was certain it was the rose joint (nylon bush) but it turns out it was far from it.. the problem turned out to be the split bearings, which the selecter shaft goes through, was heavily worn and in turn caused the shaft to lower down on the rose joint selector shaft pin/bolt, which caused all the play.
I'm in the process of drilling the hole in the remote casting bigger and then making a bronze bearing to fit. New split bearings wobble around on the selector shaft, so that has wear as well.