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Mike Brooks Custom Muzzleloaders
Now we're ready to inlet the lock internals. Do this piece by piece. With the lock plate in position, stick a pencil in the screw holes in the lock plate, marking the wood under neath as to where the lock parts are attached. Start out with the tumbler bridle as shown then once you have that in, put in the tumbler and repeat the process until you get all the lock parts in and moving freely with no bind ups.
I use a 5/16" Forestner bit to remove the bulk of the wood in the lock mortise, then do the clean up and fine adjustment with chisels.
Heres what the lock mortise should look like when all of the parts have been inlet. The mainspring may be a little wide and hit the barrel, I grind a bit off the offending part of the mainspring away until it fits together.