Reproduction mirror illuminators for Wild theodolites

I've been wanting an additional mirror illuminator for my Wild T2. The theodolite was an eBay purchase and unfortunately came with only one illuminator. (It does get old to hold up a white card to the side of the instrument.)

Karaco has them for $75, but for those who don't need originals, it's nice to have a less expensive source. So I've made a CAD model available:

Onshape (need to sign up for a free account to view/copy/modify/download):

https://cad.onshape.com/documents/02b9ab8ea12fd9b5067963d2/w/a02be99505e5e785881a76b6/e/1625ed033bed21eb1d401d4f

Youmagine (no need for an account to view/download):

https://www.youmagine.com/designs/mirror-illuminators-for-wild-theodolites

A print from Shapeways in their "frosted ultra detail" acrylic material turned out quite well. I also did an ABS prototype on my FDM printer which was perfectly functional but a little ratty-looking for the purpose because of the visible layers. The photo shows the original on the left and the painted Shapeways parts on the right. One needs to mix some acrylic artist's paint to the appropriate shade of "Leica green".

Bill of materials:

- 3D-printed mirror cell and base
- Dowel pin, McMaster 91585A016
- Setscrew, McMaster 92029A093
- Mirror, 25.4 mm diameter, 1.5 mm thick, http://www.amazon.com/gp/product/B014Q7AVKG
- Thin, high-tack double-sided adhesive tape to affix mirror to cell

Some light sanding/reaming of the hinge holes is necessary for a good dowel-pin fit; also the setscrew hole should be manually tapped M2.5x0.45 (although theoretically the internal thread could be 3d-printed).

The CAD model has as parameter the diameter of the mirror. The original part has a mirror with diameter 23.5 mm, but small circular second-surface mirrors are more readily available in 1-inch (25.4 mm) diameter, so the CAD model can be adjusted for that.

CNC milling in bronze would also be a reasonable way to go, for better durability.

Cheers,
Peter