Inventory: The two tensioners are torn off close to the bar which forms the edge of one of the curtains, this bar is twisted, and in curious posture.
The Pentax S1a is mechanically different from the Spotmatic, so I can not reuse one of my recovery hulls. The replacement of a curtain would prove to be extremely complicated, so, as this camera is for me, I tried an unusual repair:
After straightening the bar, I reassembled the tensioners gluing two small patches from a Zenit curtain. The maneuver is a little delicate, the glue has trouble holding, and the curtain hangs a little. The next day, after drying, the operating improved, and becomes perfect after degumming mechanisms.
After cleaning and reassembly, the repair is invisible and the body works like a new, no light leakage, you could expose a film without worry.