66 Dart GT HT Whatsitgonnabe?

Don't worry, I won't be that reckless. Trying to figure out how to make a zip-tie do the job. And I consider myself pretty handy with those.
I suppose a narrow one that fits in the groove is one way. I'm not sure relying on friction is all that great.

I could slot a washer and crimp it in place, I suppose ...