K40 Manual Z-Table

My K40 laser doesn't have the most square gantry and I've adjusted it as best I can.
I found it still deviated about 2mm left-to-right and front-to-back.

I took inspiration from how many 3D printers level the build plate and designed this manual Z-Table. This will allow me to make very precise height adjustments at each corner to keep a consistent distance between my lens and work material.

I also designed a holder for a Tire Tread Depth Gauge here - https://www.thingiverse.com/thing:4807179

This allows me to set a very precise distance based on the thickness of the material being cut/engraved.

This would also allow me to engrave on objects that weren't perfectly flat, taking measurements and adjusting the bed-level.

The frame is 3/4" aluminum tube which I got at a home-improvement center. I used 3/8" x 3" long bolts.

I've included an SVG file for a corner template what you can use to notch the expanded steel bed and also provides a platform to take leveling meas