Quote Originally Posted by radu_c View Post
It’s not mentioning specifically the retainer key pitch but since I have the thread dimensions now, I can work it out from ASME or ISO standards.
What's the "retainer key pitch", and why do you need it?

None of the wrenches I've used over the last 50+ years have any threaded feature related to the shutter threads. A few of them have a pivot with a lateral screw to set the separation of the ends, but that's all.

- Leigh