Laser focus adjustment wheel

A laser focus adjuster wheel for the common 33x33mm laser diode modules from China (Banggood, Aliexpress, etc).
(500mW, 1000mW, 1600mW, 2000mW, 2500mW).
Simply push it on the adjustment ring and it will make adjusting the focus a lot easier and not as big risk at getting your fingers burnt!

[LASER UNIT EXAMPLE]
www.banggood.com/445nm-2_5W-2500mW-Blue-Laser-Module-With-Heatsink-For-DIY-Laser-Cutter-Engraver-p-993521.html

[Update 2016-06-06]
Increased wall thickness and decreased diameter slightly to improve grip.

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