I bought this movement to learn basic disassembly, cleaning, and reassembly on my first encounter with a contemporary Swiss clone. When reattaching the Incablock upper spring to prepare the lower plate with the balance (cap jewels removed) I had my first encounter with a UFO.  I wan't sufficiently careful manipulating the spring back to close and it flew off, of course, never to be seen again. Lesson learned. I got a few "practice" Incablock settings and now I have a better feel on how to open a