Broken Adjustable Height Chair Spacer

So this is my first designed thing ever and it was to fix my computer chair.

I have a nice comfy computer chair, except recently the height adjustment cylinder no longer holds pressure and it slowly falls over the course of a few minutes. It's very annoying as I can't comfortable use the computer with the chair low and have to raise it again repeatedly. So I designed a piece to snap onto the bar shaft and keep it from collapsing.

I doubt this will help many others but figured I'd post it