first we need a little more info.... is your woodsman a target or match ? post or prewar?
second, whats the sight screw doing? spinning (stripped) or frozen?
if its frozen you can remove the rear sight assembly and put a few drops of penetrating oil on it, let is sit a day or so and see if it will not loosen up.
if it is stripped you might be able to put some pressure on it , pushing the blade to the right while turning the screw....
sight assemblies and a few sight parts for SOME variations are available at numrich gun parts