Sellita 210-1 stem comes out on its own/can't set time

[Nolan7171771]

Well I messed up my new watch assembly.

I put together my watch, was pretty proud of it. Everything was working. The only thing left was to cut the stem to size, put it back together, and celebrate.

I took the stem out, cut it, tried putting it back in and couldn't quite get it to go in all the way. Tried a few times and eventually the stem went in and I was able to wind and it set the time.

But the stem was still just a little too long...

Took the stem back out, cut a tiny amount off, and tried again. Again, stem didn't want to go in fully. Finally got it in again, but then it didn't lock. I can wind the time but if I try to set the time I can just pull the stem out with my hand without pushing the pin.

That's the state the watch is in now. Not sure what to do.

 It's a Sellita 210-1 manual wind movement.

Thanks for any advice!

[Nolan7171771]

For anyone who finds this later, I resolved this with a new stem. I cut the original just a little too short. There are other ways this can happen, luckily mine just needed a new stem.