How did you do this? How hard was it? Did you find a video showing how it's done or just went for ityourself?
I've got the same problem, play between the steel shaft and the plastic handle. It's my biggest problem with my now 9 year old X52.
I will see if I can find a pic of it with one side of the handle off. It's not that hard. There are 4x hex screws and about the same self tapping screws. The screw that holds the twist pot in place. then you can slide the pot and yaw lock mechanism up the shaft. You will see where the steel tube fits over the plastic part the shaft assembly sits. Just make sure you don't mistake the area you glue with the slot where the wires come out. That also has a pin to align the handle and take the pressure of the twist rudder.
The glue area is right where the metal shaft ends. Get some super glue, preferably the type that dries a little slower so you can wiggle the shaft and let the glue seep into the crack. hold it for half a minute. Put it all back together again.
That and the magnet mod and it will be better than a new X52 pro, let alone the old x52. The weak spring doesn't seem that bad after because there is no play in the top of the handle. You need the firmer spring normally to push against the handle and hide the play more than anything else.
If I find a good pic I will post it. I did take one because the pot assembly is a little confusing once removed.
Oh, and the glue doesn't effect the twist rudder which happens further up near where the wires come out.
The hardest part of disassemble is the big trigger guard and the pinkie trigger.
And just make sure the main trigger is pressed in slightly when you push the halves of the handle together since it will prevent the two halves closing.
It sounds more complicated above than it really is. But is still a little fiddly.
Found a pic that showed enough to give a approximate idea.