Hello everyone,

I'm trying to fix my wife's Trek Navigator 50 bicycle. It had an issue with the tilt of the seat, and in trying to figure out how to remove the seat post from the bicycle to address that problem, I unscrewed a lock ring that was on the shaft. Now, for the life of me, I can't get the ring to thread back onto the post. I'm fairly mechanically inclined and have worked on quite a few car projects, but this is my first time working on a bike. Is there anything I'm missing? I've tried as much force as I feel I can apply, but the ring doesn't push far enough down to engage the threads, or so it seems. There are a few pieces that seem to interconnect (one piece within / underneath the lock ring itself, that has one slope on each side of the post; these slopes seem to push down into a plastic circular cup that sits above the threads). I tried to post a couple of images of the part, but it seems as though I must have 10 posts before I can do that. If I have time, I'll post in a few other threads and come back here to post some images later on.

Any help is much appreciated!

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You are barking up the wrong tree. The posted pictures have nothing to do with the tilt of the saddle

Suspension seatpost. Push down on the seat to compress the spring while you try to rethread the collar.
Tilt of the saddle will likely be an allen under the seat

Most suspension posts of the telescoping design have a bunch or slop as they wear, especially rotationally. Many riders never feel this. Most suspension posts have no aftermarket service parts like bushings or springs. But as mentioned this has nearly nothing to do with the saddle tilt. That's the clamp the holds the seat rails at the post's very top. Most suspension posts have rather low cost rail clamps and the clamp can get worn out also. Andy

Yep, try backing out the allen key on the other end to reduce the spring tension while you try to rethread it.