A wheel I made for the zoom function on my Thrustmaster HOTAS. I've modded the HOTAS by splicing wires from the gray "slider" handle to the left of the throttle (see picture), and up to the handle for easier access.
The one in the picture is the prototype for testing, but I added pattern in front as well so I can easily put my finger on top of the wheel and spin it.
Guess it works well with other applications as well. :)
Happy usage.