Self-centering doweling jig

Hello everyone, just a quick project request from colleague so I made it so that I will weld it with 3d pen afterwards , so parts do not "click" :)

Here is video of assembly - https://youtu.be/N4n44Qi6NmU

Edit1: added small nozzle addon that you can insert into thing in the center, so small pens and pencils wont wobble all over the place and you can draw a straight line