Help! mass keeps breaking off chain rig

I am trying to get a large mass to hang from this chain rig but i cant figure out how to get it to stay attached when i simulate the physics.

Here is my .blend if anyone wants to take a look.

MIGHTY_MAGNET.blend (1.09 MB)

i was able to tweak the masses to the point where it hesitates as if it wants to stay attached but it still breaks. I also tried lowering the mass of the hanging object as low as it can go but still no luck.

any ideas?