I'll try...

In the aeroplane industry they use a kind of waxed cord ('vetkoord' in Dutch). When tightened this cord tends to 'grip' the other threads, thus fastening quite well.

The knot used is a bit more difficult the explain...
First you double up the cord along the long axis of the wiring loom, leaving about 4 inches (10cm) of cord dangling. The resulting loop points toward the microphone.
Next you wind the cord around the wiring loom from the end of the attachment thingie towards the loop (and towards the mic itself). When done, you cut the winding cord and tuck it through the loop.
Pulling the dangling piece of rope, you'll pull the loop and the end of the cord under the winded bit, securing it all in place.
Cut all the loose ends and Bob's your uncle!

Sometimes they use this trick in two separate parts, about 1/4 of an inch apart, for instance when securing the thin oxygen hose to the inlet ring of the D-type oxygen mask.

I'm not sure were you can buy this waxed cord, but I figure waxing a bit of beige garden cord will do the trick nicely!

Cheers, Toine