Qty 6: 4-40 x 1/2 Socket Head Cap Screw (McMaster 92196A110)
Qty 1: 2.5" x 1/4" OD Spring (McMaster 9657K171)
Qty 1: 1/4" x 1-3/8" Clevis Pin (McMaster 97245A242)
Qty 1: 1/16" Cotter Pin (McMaster 98335A044)
Qty 1: .56" Dia x .063" wire x 120 deg Torsion Spring (McMaster 9271K641)
If you do not want to buy the quantities above from McMaster (~$50 total) I have plenty of leftovers and can send them to you for $10 + actual shipping. If you are interested, you can reach me at email@example.com.
1) Screw the left cap onto the left slide and the right cap onto the right slide. It really helps to start the screws a few turns in each of the holes first then take them back out and assemble the two parts.
2) The recess down the center of the right slide has to fit over the square piece of material underneath the left slide. After the right slide is over the square piece of material the two pieces can slide together.
3) Feed the spring through the hole in the bottom of the right slide (BE CAREFUL! Wear some glasses so the spring doesn't shoot out and hit you in the eye!! You think it won't happen, but it will)
4) Load the celvis pin through the bushing then screw the bushing to the bottom of the right slide.
5) Next put the 2 clips together to install the torsion spring.
6) This is by far the most difficult part of the assy process and once again, BE CAREFUL! Wear some glasses so the spring doesn't shoot out and hit you in the eye!! You think it won't happen, but it will... Squeeze the long arms of the torsion spring together and insert inside the back of the clips (it way help to wear some time of gloves because the ends of the springs can be sharp). While you are still holding the ends of the spring, take the slide assembly and place the clevis pin through the larger hole on the top side of the clips, thru the spring and thru the small hole on the bottom side of the clips.
7) Once the clevis pin is thru the bottom hole of the clip then put the cotter pin thru the small hole at the end of the clevis pin.
8) You will need to trim the ends of the spring with a diagonal cutter. Trim them short enough that you will not cut yourself on the trimmed ends when using the device.
One thing to note is that these holes were sized to work well on my printer . You may need to make the holes larger if the resolution on your printer is different. The clips should move very smoothly otherwise they will not grip the eyepiece very well. These were printed on a printer with support but were designed to work on a printer without support. Let me know if there are any issues.
You can see other projects of mine at arsenalproducts.com.