Camera stand flat top

I have several camera light stands that don't have a top (so they just end with the tube). This is a thing that extends down into the empty tube in the camera light stand and uses that to support a platform on the top of the light stand. Basically, I now have a flat platform on the top of camera lighting stands. I use it to put a laser level on so I can hang pictures, but it can also be used to rest things on, put a flash on, etc. Note that I can't promise that it will be stable enough so th