So, I was scavenging through my old toy bin at the attic and I've found AOE Construct Bots Dinobots(Grimlock, Slag and Strafe) and after putting them back together and displaying them in beast modes I've noticed an issue. The ball joint melted into socket look and loosen up which makes Grimlock and Strafe unstable. Does somebody knows how to tighten their ball joints?

 

I guess it depends on the cause. I don't own any constructbots but have had bionicle figures. If the socket/cup part is cracking or expanded maybe some layers of super glue - if you do this don't try to glue the crack shut, rather try to fill it - gluing it shut will just make it snap again the second you reinsert the ball joint). This can be hit or miss though.

If it's just general looseness - the ball stays in the socket but just has a lack of friction you can use something like floor polish - but it'll loosen again over time- basically you're just trying to create friction.