Translogic quickshifter top part damaged!

Hi guys, so been running my trasnlogic quickshifter for a couple of years now and has been great.

Tonight at the track the top part connecting on to the bike has came off, looks like it's worn off completely.

It's the circle part at that top, does anyone know what this is called and where I can get one?

Thanks

 

Any chance of a picture, probably a ball joint or the other name used , rod end