Thats an easy initial fix. The screw is stuck in the winding mechanism, so once the winding mechanism is removed the screw should be easily accessible. The wheel that you see the screw in is part of the winding mechanism and once you remove that the screw will come with it. The winding mechanism is held in place by 2 screws, one at each end. The problem is you would need to remove the rotor first as it wont turn far enough to give access to the screw at one end.
Removing the rotor is straight forward enough, you remove the small screw next the center, lift up the small metal piece and then the rotor.
Its fiddly work so if you dont have the necessary tools then best left to a watch maker and should not take them long.
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