Got around to finishing up the conversion of the Simplex secondary clock. Wasn’t much to do besides grind down the shaft for the minute hand, install it, and seal things back up.

Kinda interesting how the concave glass cover is retained. There’s a really long spring wound around a piece of wire, with one spot where the spring is cut and bent outward to provide a place to hook it. To remove the glass, you loop something through there and pull, and it’ll pop right out. To reinstall, you seat the spring along the edge and just shove it in there.