Ratcheting rope tensioner

I got this idea after trying to tighten the rope around my recycling boxes. It is a ratcheting tightener that would snap onto a rope. The mechanism is pretty simple, the key is that it comes into two halves which you snap together around the rope/wire you want to tighten. As you twist it, the rope tightens. You could make them disposable for sending packages or you could make them industrial strength for tightening wires or rope.

My friends who know how to tie knots told me I should just learn how to tie knots..