12. On the other end of the stem is screw thread.  This will be screwed into the hole in the pendulum ball.  This should be screwed in as tightly as possible.
13. The assembly should now look like Figure 3-5 below.

Figure 2-6: Partial Assembly to Step 13

14. Pin hole 2 will be attached with the same procedure as the pendulum shaft pin hole.
15. This stem will then screw into the hole on the top of the large diameter shaft.  It should be screwed in as tightly as possible. 
16. It is also important to make sure that it is not turned once it is set.  This could cause errors in data.
17. The face of pin hole 2 should be parallel with the face of pin hole 1