This is a holder specifically for these lenses: http://www.banggood.com/4-Lens-Headband-LED-Head-Light-Magnifier-Magnifying-Glass-Loupe-p-950353.html They will clip on. If it's too tight, you may have to file the opening a little wider. Use either a M3 or M4 screw and a nut/lock nut. For me, the 2.5x ones work best with a 5" monitor at about half way down the slot. It should be easy to use this lens holder with any DIY facebox by simply providing a 4-5mm wide slot at the top. The biggest advantage is the highly clear image, without the loss of quality from a fresnel type lens. There's still some pillow effect distortion at the the edges, though, depending on which lens is used.Printed in PETG at 15% infill. Hardware needed: M3 or M4 bolt (10mm for normal nut, 14mm for lock nut) M4 washer (works for either, larger surface area than m3 washer) M3 or M4 nut or lock nut. Magnifying lenses from this kit: http://www.banggood.com/4-Lens-Headband-LED-Head-Light-Magnifier-Magnifying-Glass-Loupe-p-950353.html