Movements that use screws to hold the stem in place are not very common, but if you do run into one they are very easy to remove. Follow the steps below to remove the stem from the watch movement.
Locate the screw to be loosened. These screws go into the movement on either side of the stem. Lay watch face down on a Selvyt cloth or movement dial side down on a piece of pithwood.
Turn the screw counter clockwise three to four turns (screw does not need to be removed from the movement).
Remove the stem by gently pulling it straight out of the movement.