Figure 2-7: Completed Assembly without Outer Casing

18. The mirror stem will be inserted into hole 2 on shaft 1. 
19. The top portion of this stem should already be bent to a 45° angle. It may have the mirror already attached.  The bottom part should still be straight to insert it into the hole. 
20. Insert the stem into the hole until the desired length. 
21. Once it is the desired length the bottom portion should be bent to 45° also
22. A mirror should then be attached to this 45° bend.
23. The assembly should look like figure 5 above
24. Readjust the length if it changed any. 
25. Use a set screw to secure the position

Figure 2-8: Finished Assembly

26. The outer casing is the part that will connect with the device in the magnet bore.  It will experience the same rotation as the device.  This is a hollow cylinder that has a solid disc at one end.  It is all one rigid body. 
27. This solid disc will attach to the bearing.  The bearing will be press fitted into the circular indentation on the inside surface.  This will allow for independent rotation of the large diameter shaft and the small diameter shaft.