Do not take Marble's tang sights apart, they have a heavy spring in them that is really hard to get wound & back in correctly, they really require having special tools. The sight dealers I know, who deal with these sights can't fix then themselves and send them sights to a person in the UP of Michigan or another in Alaska to get them put back together.
Marbles tang sights cannot be adjusted for 'travel' - they are supposed to be spring loaded so that they snap back into the correct angle for use if they are folded either way. They should move smooth and free, but should have a very strong spring pressure when trying to fold them either way.
The piece with what looks like 'a gear tooth' on the end is used to lock the sight folded down against the spring pressure trying to snap it back up.
I see a lot of these sights incorrectly assembled so they do not work correctly, or even just left in parts after someone has tried to take them apart or adjust them. I have returned some I bought that arrived not in working condition - one just recently.
A place called Aperture & More has newly made eyepieces for these for about $15 each. The thread on the ones for Marbles sights is a smaller size than Lyman of others.
Here is a short video of how a marbles sight is supposed to work - http://vid200.photobucket.com/albums...psx0so2ubq.mp4
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