When I switched to an extended mag release on my SP-01 DA/SA I backed out the staked screw that retains the mag release spring and trigger bar spring. I removed the springs and switched out the mag releases. Since I performed this operation with the hammer down, the trigger and trigger bar were far enough forward that I could back out the screw without removing the trigger or trigger bar. With my 75 SA the trigger, being single action only, is located farther to the rear and the front of the trigger bar obstructs my access to the screw. Unless I am missing something, to remove the screw to make the same mag release switch on my SA, I must remove the trigger and trigger bar, correct?