malachi,
During that 1/3 trigger travel, had the cylinder began to turn, and how much?
The reason why I'm asking is, there is a delay in the cylinder turning, as the trigger is pulled, because the cylinder stop has to be pulled down out of the notch in the cylinder before the hand starts turning the cylinder around. If it hasn't began turning yet, then it is the cylinder stop not working all the time.
If that be the case, swing the cylinder out, and take a small punch, or even a round toothpick, and push it into the hole in the bottom front of the frame, mashing the plunger in it inward. Then, pull the cylinder and crane out to the side, remove the punch, but keep your finger over the hole. Capture the plunger and spring in the hole, and make sure the spring isn't bent, etc. If good, place both back in the hole, and make sure the rear of the spring goes over the pin you see in the back of the hole. Then, depress this again, and place the crane back into its slot in the frame, and once in as far as it can go, pull the punch out, while mashing the crane the rest of the way into the slot, so the plunger can go forward through the hole in the crane.