The problem.
the 50watt Co2 laser cutter is a great machine but does need modifications to make it great. the aiming led diode is as more of a line than a dot and with no focus its not adjustable. I was one of the laser Facebook groups. were a saw a post on modifying laser pointer to form a crosshair. so I asked for a copy of the designs. and started on this journey.
So I have removed the current diode that interestingly was not soldered. so I will be swapping leases I have added a jst female connector to the led wiring. I will also be adding a switch so can turn it on and off. I have soldered the male end to the lasers.
Female JST connector soldered in place 
prototype have shorten the lead as way too long
theses will be placed at 90 degrees to the tube in an acrylic holder then aligned under the nozzle. the reason for the jst connector is I can then swap it over to each tube lens.
tested last night and figured out they had sent the wrong pointers so crosshairs. (note to self, test things before soldering them) not worried will use for some other projects i have in my list of things to make or design.
I decided to hedge my bets and try 2 laser cut designs first one did not work with the line lasers fingers crossed on the second one. have changed the measurements slightly on the design to make it a tighter fit will test fit this design later don’t line up might be thickness I going to do some more testing and do one more design as well to see if I can get it lined up.
Argh another bust time to look for 3d printed files.
right thingiverse design attempt number 3 and away it goes.
Another non-working idea as designed for smaller led diode modules. so that again was for smaller diode laser dot it replicated standard hardware. after had metal and printed version, I inverted the 2 diode holders and lightbulb moment.
So i made a sketch of the part and then modified it using some 3d modeling.
The idea to make a bigger version of the arm 
The Sketch in fusion 360 
Rendered idea 
Early morning 3D printing 
Parts ready to test
Right now to test it. out and see if it all fits will publish the files if so. wish me luck. little loose but concept works have changed the inner dimensions from 13mm to 12mm reprinted it now to test fit and tighten it all down if it works might re design the center as well.
I have published the remix here you will also need 2 x of the centre the tube mounting off this design by billkaroly from Thingiverse available here. You will also need some 3mm bolts and nuts.
Next modification will be moving and permanently mounting mA meter temp gauge upgrade. adding some button for lighting, laser marker and ultimate air assist on / off.
