[NostalgiaRadioTime]

I took a peek in the back of my T7-5 and see what you mean. I remembered the Philco I did that to and believe it only had one washer between the clip and the chassis.

You could experiment with grinding down a rivet on a scrap piece of metal to see how well it will hold. I would think once the rivet is mushroomed in place, even without some of the head it should still hold. This is only a thought, however. I've never personally tried it.

Or perhaps you could add a small fiber washer between the two pieces of phenolic so that the rivet head would fit in the hole of the washer. That would act as a spacer to prevent the rivet head from grounding out against the chassis.

Easier said than done, I know, as I only had to deal with just the one broken clip and it was on a Philco.