I have that AFV and just had a look so, I am with you. Its good that the MG itself is not the issue and, looking at mine now as I type this I would think its the way it was made. I would just use some good superglue and reaffix the ball mount back into place.
Take any excess paint off before you do and use some tweezers etc to hold it in place, as its fiddly.
If any paint is missing when you rattach it just touch up with a US olive drab
Hope its some help
Mitch