Hand brake button and plunger rods

Hello all, recently the button on my handbrake lever has started to rotate freely, the handbrake still pulls on fine and releases but occasionally, due to the plunger rod rotating with the button, the rod pops out of the wee connector plate meaning no handbrake, a bit of fiddling and it catches again but it’s a major PIA in town!

Question is, how to prevent this rotation?

Pics of the offending rod and the bit it pops out of

Thanks all
John

The cross bolt of the link plate may need tightening.
Hook on link rod may need a tweek so it holds better.
Side plates of lever may need a little squeeze to prevent rod hook escape.
Button only rotates if hook has come out or its threads to rod have gone.

I've just had the whole thing out and it seems the hook had rotated somehow and so could pop out, I've turned it through 180 and it seems to fit snugly ...I've also squeezed the sides of the handle in the vice so hopefully it'll hold against it a bit better. its a real B'Stard though....anyway back in now, so we will see. Button is solid on threads and it no longer spins.