This STL File is a Lens Removal Tool for CO2 Laser's. The end that inserts into the lens tube is 20mm in diameter and the pin holes are 17mm apart. It is designed for Lens Tube Retaining Rings that will accept this size tool.
You will need qty 2 of 2mm pins or cut off some 2mm solid stainless wire approx 6-8mm long. I suggest installing them by holding one pin at a time in a pair of needle nose pliers and heating them with a lighter.
Then push the pin into the hole in the tool leaving 2mm - 3mm sticking out (As shown in picture below)
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This file is FREE. There is no need to make any payment but if you like this file and would like to donate money to me for time and effort spent you can paypal me at https://paypal.me/PlasticSpider .