I was changing the hands on a Vostok 2415, and when I cased the watch up again, I found I could not return the stem and crown to the movement. What is strange, Is that if I take the movement out of the case the crown reengages just fine. The 2415 has a spring release stem, I am wondering if anybody else has ever had this problem with the same movement or with a similar movement, or has any ideas on how to fix this.