Erie, you may be the one to cure the problem for me. The timer module is the problem. a worn pivot on the lever that rides the booster spring cam edge. Since it is lose it jumps over the barrel instead of following it. I tried swaging it but the pivot hole is worn n now too large to stay steady on the pin, it wobbles.
I remeber you said you had a 180 that needed some repair. Waht is wrong with your shutter? Tell me what kind of PC is on that shutter?... does it have the button, the PC socket is mounted on the barrel by 2 screws?
e-mail me, we can discuss this more?