thats why you shouldnt mess with watches, everytime I did it, I had similar problems as you are describing now. Once one of the clamps got lose after some time and jammed the movement, once the crown wouldnt work properly anymore, once I got a little hair into a movement and hat to disassemble some parts, remove the hair, took me at least 15hours to complete the job...
I dont know what it is with watches, but for some reason they tend to have issues fairly easy, if you work on them and are not a watchgod!