ULS X660 4.0 Focus Tool

We received a new (to us) ULS X660 Laser Cutter with the 4.0 lens at our maker space in New Haven, named MakeHaven. We did not have a focus tool, so I whipped this up so we can focus it. The real tool has an adjustable level because lenses may not be perfectly focus; so this may not perfectly focus your laser. The laser head should just bump the tool aside, and you are focused.
Realized scale was off, corrected and uploaded.