Convergence ?

[Alex KL-1]

Some time ago, thinkering and playing with my delta gun TV (a "last generation" delta-gun; the only delta in my small collection), I almost created a thread for the convergence issue, but then I found that the TV certainly dropped, and purity is not consistent also.
This affected one side; the left side converges scary unbelievably good, basically textbook perfect, but right side, the G is not || to the R+B (coincides with bad puruty)... this is strange; normaly I see people complaining about R or B not converging to the others... this G lost even don't make sense to the convergence panel adjustment descriptions.
So, I think I can need to live with it, until I found another set.

Or, is worth to try to play a little with it?

PS.: this tube also have another problem, but I think is about the socket: is very inconsistent with focus. But, I dunno why the image is more dim when focus is wrong, go figure... (well, I never worked with delta gun CRT, so I dunno if it is a normal behaviour, or...)