One of the most interesting innovations that Rockford used was a system for securing and adjusting the jewels in the balance. By means of 2 retaining screws the jewels were held in place and could be adjusted for end shake without taking the movement apart each time.
A neat and radical innovation for the time that adds a little truth to the story of Rockfords fast paced R&D race during 1891 – 1899, when they turned out some very interesting designs.
Here we can see the adjusting/retaining screw for the lower balance jewels…
