Antenna Ground Ring

[awryexperiment]

Hi Fellows,
I am wondering if anyone has run across a similar problem where their antenna has developed a wiggle.

My 72 C20 has a fixed mast antenna located in the factory hole (right side of the wiper cowl near the pass door). I removed the cowl and found there's a rectangular soft metal "ground ring" under the sheet metal as part of the mounting bracket.

The problem is that my ground ring developed a crack so it cannot keep the antenna mounted rigidly to the cowl. I haven't been able to find this part reproduced separately, so I would need to buy a whole new antenna kit.

Has anyone had a similar problem? Was there any way to fix the problem without replacing he entire antenna?

thanks.