The timing is adjustable. I'm pretty sure it was designed for flash bulbs, not strobes.
The knurled locking ring and threaded section enable you to move the contact trip point
in or out to set the timing. That would be of importance with flash bulbs.
I'm guessing there are two or three defined settings... all the way out, all the way in, and
possibly one in the middle. These would correspond to S, F, and M flashbulbs.
If there are only two settings they would be for S and M bulbs.
- Leigh
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