Does anyone know how to adjust one of these ASA's?

For some reason, mine went out of adjustment today and wouldn't properly press the pin valve in when screwed in. I managed to get it working, but it was starving my gun all day. It's worked fine before, so something must have gotten jarred recently.
How do I get in there and adjust that pin travel?
Thanks!

For some reason, mine went out of adjustment today and wouldn't properly press the pin valve in when screwed in. I managed to get it working, but it was starving my gun all day. It's worked fine before, so something must have gotten jarred recently.
How do I get in there and adjust that pin travel?
Thanks!
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