Start by removing the Magazine Catch/Lock Assembly for cleaning and inspection.
Push the left side button in slightly as you rotate the right screw counter-clockwise for capture.
The assembly will slide out of the right side.
Once the assembly is removed from the frame, with care, rotate the screw clockwise for the removal of the screw and its spring from the button.
Any questions contact me direct via:
Phone number exchange is available.
Further as an afterthought, make sure your 2 original 2nd Series Woodsman Magazines have the appropriate side notch for capture with the Magazine Catch/Lock. The 2nd Series Challenger Magazine does not have such a notch yet is marked "Colt" on the Base Plate.