Starting with the book, "The Underhammer Rifle" by Jeff Baron.
I wanted to make a copy of one of the books images, a "Wood Lock".
I began by re-drawing it in CADSTD just to see if the geometry is correct. I could not seem to understand how that particular design would lock up, so I continued anyway. I cut out the hammer and trigger and pinned them to a piece of Maple scrap with brass pins.
Unfortunately the first trigger showed me that what I cut out would not lock up in full cock. The hammer just pushed the trigger out of the way. So, I cut out another trigger, this one pictured, and moved the trigger pin closer and higher up so that the trigger ledge is in front of the trigger pin. A slow pulling of the trigger shows that the hammer moves downward ever so slightly, this is good I presume.
Here is a close up of the lockup. It appears that the locking area is too deep, but the trigger swings out of the way very nicely.
I have formed the hammer spring out of an old hand saw blade. I annealed the top strap area, cut out a 1/2 inch wide piece about 6 inches long. Then annealed it again to make it nice and soft for the forming.
Here is that spring, partially formed. Since it's still really warmish here in Phoenix area, I may wait to temper the spring in the bar-be-que.
Update: 9/30/2013
After playing with this lock type, It will be relegated to the "tried this one" pile. Or in other words, it may get redone at a later date, just not now.
IdeZilla.