From looking at your picture I do not see the sear adjustment screw. It is tiny and located just behind the hammer and down by the lower edge of the lock plate. Also, you might want to invest in Vol. II of the Ohio books. There are 2 pages of information and a few pictures of his guns. One of them looks to be a sister of the one you have but without the scope. Smokinbuck can help you get the book if you are interested. The individual volumes are very reasonable. As I said, I have not seen a lot of his guns. I missed a double shotgun a few years ago by less than an hour when it was sold by an online dealer. It looked to be an import that Thayer had put his name on. He was quite prolific with 2 employees. I have seen everything from plain half stocks to very fancy long range target guns. The high end target guns seemed to be his "thing" and some were quite remarkable. Your gun probably had a bullet starter or possibly a false muzzle. If there are several small holes drilled in the muzzle face and the flats run all the way to the end, it had a false muzzle, if the last couple inches was just turned down to round it had a bullet starter. Sadly, since I no longer have windows 7 and photobucket I have not posted pictures in a long time. I do need to get back onboard since I have several guns to submit for the library and it would be nice to be able to post pictures quickly like I used to do. I will try to get that done soon. Very cool gun. Thanks for sharing. If you ever run across another please let me know. Thanks, Jack