Hi Blue Lander.
It's a bit hard to describe - in writing - how the sear action functions in these snaphaunce locks, but I'll give it a try LOL : The sear arm is in constant tension against the inside of the hammer. This is accomplished with the small V-Spring located between the sear and the inside of the lockplate. See photos below. So when the hammer is pulled back to the cock position, the sear pops out of the hole in the lockplate just slightly to engage the angled slot on the inside of the hammer. At the same time, the trigger bar will move slightly rearward. Once the trigger bar is pulled backward, it will cause the sear bar to return to it's original position and release the hammer. Hope this helps.
I can't really tell by your photo, but it appears your sear spring might be missing (?).
Most of these locks you encounter will have the sear worn down. You will also find tumblers worn fron the stress of the mainspring. This is because the sears and tumblers were never tempered/hardened. I can picture these guns being fired only two-three dozen times and already need a sear adjustment.
Hope this helps. Rick
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