It's very simple:
1. Use on Vixen Flip mirror body.
2. Remove the mirror from the flip plate
3. Drill a 12mm hole central in the flip plate
4. Place a microscope slide (!) (or if you want to spend $$$ buy a pellicle and use that) using double sided tape on the front of the flip plate.
5. Re-assemble - job done!
I do have some images - they were used in the book "Astronomical Spectroscopy for Amateurs" to illustrate this guider. I'll see it I can upload them.
Works very well; I use them for guiding my spectroscopes with a Lodestar....
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