As a picture speaks a thousand words........ A similar thing can be done for a gear lever using an Allen Key.
Very useful tip, there'll be a couple of small jubilee clips in the toolkit from now on. Here's what I had to do on the way to Prague when the left hand mirror suddenly sheared and was left hanging by the indicator wiring...
I just wondered if the OP was secretly telling us he had dropped his bike not long after he had got it......