I installed the balance bearings in the horizontal plates. First, I enlarged the holes already made for them in the plates to 3/16" to fit the spigots on the bottom of the bearings. As ususal, I enlarged both holes at the same time by pinning the two plates together, as shown previously -- drilling the two holes together assures alignment. Then I unpinned the plates and super-glued each bearing in its hole, in preparation for drilling holes for mounting screws.
I mounted the bearings with 2 stainless steel 0-80 cheese-head screws. I used the holes already drilled in the bearing flanges as guides to drill the smaller holes in the plates, which I'll thread. The smaller holes were centered in the larger holes by using a transfer punch to make center divots in the plates, then the smaller holes were drilled and tapped.
You can accomplish the same thing by just starting to drill a 1/16" hole in the plates, using the existing holes in the flange of the settings as a guide. Then finish drilling with a smaller bit for the threaded hole. If you don't follow one of these procedures, the tapped holes in the plates won't be aligned with the holes in the settings.
Then I installed the balance in its new bearings and hung it from its torsion spring on the clock. The balance turns very freely -- it will turn for several minutes, once started, without an additional push. Hard steel and jewels make for very smooth bearings.
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