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With a little CLP lube on it I'm back in business. Once I got it moving, cleaning the channel with an old toothbrush and Hoppes was simple. After that a few gentle taps on the bottom of the ladder with a brass punch freed it. Then I wet the assembly with liquid wrench and let it soak for 24 hours. The remedy: I took the sight off the barrel - two screws = easy peasy. The front knob on the base adjusts windage by pivoting the base side-to-side in an arc. The top knob on the staff locks the ladder in position on the staff for elevation adjustment. The ladder insert was frozen in the staff channel and probably hadn't been moved in umpteen years. And, as expected, it also needed a good cleaning. The one on this rifle is the latter and appears original. Others had a locking knob with the ladder position being adjusted by hand. Some had worm/gear knobs to adjust the ladder. The Buffington rear sight on the later model trapdoors is really interesting. My head is trying to explode waving a candle is this done so that you get a black soot so that your mark for is visible The good part however is that the width approximates the USMC sight for the 03 rifles and you can undercut them/perfectly square the top if you like to eliminate glare or make them taller/shorter for your needs. The problem with that though it's time consuming and the closet gauge of sheet steel is just thicker than the common base width on 03 and Krag rifles. I make sight blades to fit specific rifles sometimes out of sheet steel. They're pricey though last time I looked I think they were 8-10 bucks a piece. S and S sell blanks for Krag rifles and more than likely has them for TD rifles noted already above. Bedding it in a tiny sliver of lead makes it nice and solid.

Once you get it to shape and it fits snugly, wave a candle over the pinning so you can drill it for the pin or use a scribe to get your marks so it can be drilled accurately. A dime may also be exactly the right width for the dovetail. File down an old copper penny and blacken it for your front sight.

1873 springfield trapdoor front sight