Update: Added a file, "rag hook high"... A wet rag was hanging too low in the little sink, so I put a hook part up high.

This is an easy way to hang a wet rag over the sink. It works if the spout is a straight, round tube.
I don't see any standard size tube for the faucet tubing. This one seems to be "3/4 inch", near 19mm diameter.

It's not adjustable, but it should be simple to scale this model up or down a bit, to fit other tube diameters. A small test file is provided, to play with it.