Below are brief descriptions of the parts for the design lab. I am only personally familiar with parts A--P. Parts Q--Z are donated to the purpose by the UCSD X-ray astrophysics group, who has built many instruments now in space.

1. 2-D flexure: one of six identical pieces designed to critically constrain an optical bench on a telescope. Each flexure is strong only in one dimension, permitting small motions in the other two dimensions. This is necessary to accommodate differential thermal contraction between the telescope (ambient temperature) and optical bench (kept warm). See http://physics.ucsd.edu/~tmurphy/apollo/mech.html Material: stainless steel
2. Thermal isolation standoff: Supports electronics equipment within insulated enclosure, tying telescope structure directly. The idea is to mount heavy equipment within a comparatively flimsy box, without requiring the box itself to support the weight. G-10 fiberglass was used because of its high strength and very low thermal conductivity: it won't become a cold finger. You might be able to pick out three of these in the second picture in http://physics.ucsd.edu/~tmurphy/apollo/tour.html as three small circles above the optical bench (center and right). Material: G-10 fiberglass
3. Unfinished beam baffle: meant to mount to an optical bench near a rotating turning mirror (adjacent to large back face of part). Large holes would have been bored to allow the light to come in, through the back, then back out the other side through another hole at 90 degrees. This would have gone at the 90-degree beam turn in the top picture on the page: http://physics.ucsd.edu/~tmurphy/apollo/optics_bench.html Material: aluminum 6061
4. Dummy rotating optic: designed as a temporary dynamic stand-in for a rotating optic. You can see this piece in the second picture on the page: http://physics.ucsd.edu/~tmurphy/apollo/tour.html. Glass and aluminum have nearly the same density, making this an effective trick. Material: aluminum 6061
5. Wedge support for optical post: serves to provide a tilt-table for mounting an optical post, thereby rotating the optic mounted on the post by roughly 21 degrees. This part can be seen at upper left in the top picture on the page: http://physics.ucsd.edu/~tmurphy/apollo/optics_bench.html. Material: aluminum 6061
6. Angle Bracket: made for mounting a piece of rack-mount electronics on a slide within an electronics rack. Material: painted aluminum?
7. Diffraction grating blank: An aluminum substrate onto which a diffraction grating was to be replicated (epoxy technique). There were to be two gratings with different pitches/angles: one to produce a high resolution spectrum, and the other for a low-resolution spectrum. The grating rotated about the larger hole, through which a shaft passed. The other holes accommodated a gear (pinned and screwed) to move the grating. The grating went into an infrared instrument at Palomar (see http://www.its.caltech.edu/~btsoifer/pifs/pics/grating.html). Material: aluminum 6061
8. Optical bench post: A commercial piece for mounting optics. See http://www.newfocus.com/product/model.cfm?modelno=9952. Material: stainless steel
9. Glass plate/optic holder: A commercial part for mounting glass slides, polarizers, etc. Has a padded wall and plastic-tipped screws so that the glass is not broken when pinched. Material: painted steel?
10. One-inch optics holder: A commercial part for mounting 1-inch transmissive optics. See http://www.newfocus.com/product/model.cfm?modelno=9834. Material: anodized aluminum
11. Optical bench clamp: Used to secure baseplates or other parts to an optical bench. A screw goes through the slot into the bench, the foot rests on the bench, so that the long beam may clamp down on something and keep it fixed. Material: anodized aluminum
12. Optical bench base plate: Used to mount optical posts in such a way that translation on the bench is possible (along the slots). Also some rotation is possible, in practice. Material: anodized aluminum
13. Large optical bench base plate: Serves much the same function as the previous part. Material: anodized aluminum
14. APD cover plate: made to mount to a custom circuit board on which was mounted a 40-pin DIP (dual in-line package: chip) containing an avalanche photodiode (APD). The rectangular pocket accommodated the DIP, while the four corners provided connection to the circuit board via screws and standoffs. The hole in the middle allowed light to get to the APD. The cylindrical extrusion opposite the DIP pocket allowed the unit to be attached to custom holders for attenuators, lenses, etc. Material: anodized aluminum
15. Optics cover plate: This piece mounted over an optic, permitting some clear aperture in the middle. Material: anodized aluminum
16. Optical bench rail: attaches to an optics bench, allowing translation stages to clamp on in such a way as to be able to slide for adjustment. Material: stainless steel
17. Slotted clear thingamajig: Don't know what this is, but it clearly (haha) allowed something to slide within it. Material: lucite/acrylic
18. Detector jacket mold: tab formed pocket in silicone rubber mold that later housed a detector of the same size. Material: aluminum 6061
19. Collimator disk holder: A disk insert was moved from one position to the other in a X-ray detector collimation test. Material: aluminum 6061
20. Flanged cylinder: optical separator separating two lenses; part of the preparation for the Gamma Ray Observatory. Material: aluminum 6061
21. Fine collimation fixture: part of x-y stage to capture tungsten collimator assembly. Material: aluminum 6061
22. Launch lock mechanism: used to hold (cage) a part during the vibration-crazy launch of a satellite; later retracted. Material: stainless steel 316
23. 80/20 structural beam: A short section of 1.5-inch extruded structural beam. Like an I-beam, this geometry puts a lot of material far from the central axis for rigidity. See the 8020 website, profile 1515 for more info. For an example of this "erector set" in use, see the APOLLO cabinet (third picture down). Material: clear-anodized aluminum
24. PMT vibe fixture: presumably something that was used to mount a photomultiplier tube (PMT) in a vibration test prior to launch. Material: aluminum 6061
25. Assembly fixture 1: With next part, a pillow block for supporting a photomultiplier tube on a horizontal axis for balancing a detector platform prior to launch in the X-ray Timing Explorer (XTE). Note: you must treat this as two separate parts put together in SolidWorks as an assembly, supplying drawings for both pieces. Material: aluminum and stainless steel
26. Assembly fixture 2: See notes for previous part. Note: you must treat this as two separate parts put together in SolidWorks as an assembly, supplying drawings for both pieces. Material: aluminum and stainless steel