The picture is a foot retainer. It just pops on. I would throw that movement away and get a chinese clone of the 2836. I've had nothing but problems with those movements. Probably what happened when you took the stem out, is you pressed the button down to far. That button is on the bottom of the set lever. When the set lever get's pushed to far up, it allows the yoke to slip out of place. DO NOT keep pulling on the stem, because you may bend the yoke corrector. Take the movement out, remove the bridge over the hour wheel, the remove the retainer over the keyless assy. You will probably see the yoke out of place. It sits in the groove over the clutch. Put it back over it, reinstall the keyless cover. When you do, at the top of that cover you will see a piece of metal that looks spring loaded. It is. Snug the screw that holds the keyless works, the push that piece of metal over the small tab that you see. That's the top of the yoke. Then tighten the screw and put it back together. Hopefully it works