No, but I probably should have, as the mag well was fractionally too short as a result. I maintained the gap and just filled it with weld. I didn't think to check the length, foolishly assuming that it was correct. Everything else was wrong about the earlier restoration so I've no idea why I trusted that! Even so, I got it far straighter than before. Rather than cutting and welding a second time I trimmed the mag and retaining studs so it would fit. Lesson learned if I ever do anything like it again.