These are the build instructions for my LS-532 CB/fiber optic laser collimation tube (at least this is what I call it)
The labeling serves a great purpose also, LS-means laser system, 532-means 532nm (green laser) CB-means collimation bandpass filter installed (532nm).
Step 1: 12vdc LED Assembly
I got a bunch of these assemblies from http://www.allelectronics.com, real cheap, they are UV (405nm) and they come in handy for all kinds of stuff, in this particular instance, the LED housing itself worked perfect as the aspheric doublet lens holder, which fits in place in the eyepiece assembly inlay where the 8mm lens use to sit.
You can either use the lens that comes with the 8mm telescope eye piece of purchase them yourself for a reasonable price (depending on the application and quality you are looking for,) @
Step 2: Cutting the Wiring Harness Off
Use a pair of side cutters, wire cutters, to cut the wiring harness and associated parts from the lens holder so it looks like this.
Step 3: Pushing the LED Bulb Out
Please, use an impact hole punch it will do this job cleanly in one movement (timesaver.)
Step 4: These Are the Only Drill Bits You Will Need
Step 5: Showing the Drilling Direction
Step 6: Shaping the Forward Facing End
Step 7: Final Shape of Lens Holder Assembly
Step 8: The Lens Itself
This is the lens that you will carefully place in the beveled face of the holder, I used a "magic cloth," lint free, on a padded surface and placed the lens in the beveled groove and pressed it firmly in place.
Depending on how careful you were in preparing the face, it may drop in "too" nicely and you might have to appy a tiny fraction of acrylic glue to the inside edge and let the lens dry in place.
The most critical aspect of this step is perfect alignment! The lens to operate correctly, must be parallel to the farthest exit and closest opening, to avoid any reflective aberrations.
Step 9: Final Lens Holder Product Ready for Mounting...
Step 10: Mounting the Lens Holder
This is another critical part of the assembly, mounting the lens holder in the 1.25'' 8mm telescope eye piece.
Step 11: These Are the Specifications for the Lens Itself and How the Focal Length Calculations Are Arrived
Step 12: Official Specifications of the Entire Collimation Tube Assembly
Step 13: Actual Collimation Tube Assembly in Action
Step 14: Diagram Illustration for Focal Length Laser Calculations
DavidH908 made it!