Celestron 40mm lens case

The 40mm lens comes in a thin cardboard box, so I made this.
I knurled the cap to get s good grip and squared off the end so it won't roll of a table.

Slight Update: I made a screw cap with room for a 1 1/4" moon filter too. I tend to use it on my 40mm when observing the moon (or just put on the diagonal).