At some point most of us cause a "stupid scratch." If you field-strip and then reassemble your 1911s enough, you'll probably get one. Saying that, the internet warriors will chime in and say that only an idiot causes a stupid scratch and that they've never, and will never cause one. Well, bully for them. If you've got a tight and strong plunger tube protrusion, it's tough not to cause a small one. Don't beat yourself up if you do it again. Just be as careful as you can.