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If the vid doesn't start at 1:20, skip ahead to 1:20
So notice how the disconnector (what I called the "rear sear" earlier) catches the hammer on ejection. Notice the disconnector has a spring and pivot.
When the bolt goes forward the hammer is held by the disconnector until the shooter releases the trigger and the disconnector releases the hammer, but the primary sear catches it before it can fly forward and strike the firing pin.
The goal here is to adjust the disconnector such that it is more to the rear (to the right in the vid) and there is more space between it and the primary sear, such that when the trigger is released, the primary sear does not catch the hammer, but rather the hammer flies forward to strike the firing pin.
Then the bolt goes back on ejection and the primary sear catches the hammer and you can repeat the process.
In many AKs, the disconnector most forward position is controlled by the bottom part of the disconnector resting against the inside under portion of the receiver.
Strip the gun down by removing the receiver cover, then remove the bolt carrier from the gun. Pull the trigger so that the hammer flies forward. Now you can see down into the trigger.
By pulling back on the disconnector with a finger and looking down into the trigger, you can see where the disconnector rests against the bottom of the receiver, usually just a little to the rear of where the trigger lever enters the receiver. That is where someone could put a bit of a shim between the disconnector and the receiver - I used a piece feeler gauge. I tried different thicknesses until the disconnector was moved enough to the rear that I got a binary trigger pull.
It wasn't perfect, I still got a few times when the hammer would follow the bolt home after ejection.
But that is the principle.
It was fun to shoot, but not reliable. I only did it once, and it was ohhh... maybe 25-30 years ago. I have not done it since.
I am sure the commercial mechanisms are more sophisticated, reliable and safer.