If she moves, don't pull that faceplate! I did on a rusty one I had there were problems getting it back together. I finally did, but it was a BEAR! (Well...I didn't, but the spousal unit turned the air blue in his efforts!!
He also threatened me if I ever did that again with a machine like this!) Treadleon has a large "White" following...maybe ask there? (I didn't....just tore in like I knew what I was doing...but didn't!)
As for the locked drawer? Use a small screwdriver. Most treadles take either a triangular or square key to open.