Hello! I am an absolute watch repairing novice. While attempting to replace the winding stem of my Gruen Curvex from the 40s (I suspect), as I was loosening the bolt screw, I believe I may have unscrewed too much and released the 'bolt piece' from underneath. If someone could please provide me with further information on how to remedy this situation, I would be very very appreciative! Thanks so much. The watch I am working on is a Gruen Curvex 17 Jewel Precision, printed on the inside of the case is the following: G466293 440 498