Quote:
What does the little lever behind the mainspring do?

Just a wild guess while awaiting the answer, but it looks to me to be a part of the sear mechanism.
Can't recall ever seeing another mechanism which used a link between the mainspring & hammer in the "Push mode" before. A link in the pull mode is of course quite common, particularly with bar action sidelocks.
Note, the Lefever is a boxlock, though the earlier ones did carry the sears on the plate, so were a sort of "Hybrid".

Last edited by 2-piper; 09/15/09 08:41 AM.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra