Has anyone ever had the spot welds fail on the arched, gear that meshes with the motor to actuate the scissor lift on the window?

My driver-side window will not go up, so I took the door panel off yesterday. I could hear and see the motor operate, but no go on the window. I finally pushed the window back up while operating th motor, and the window went back up, but when it "bottomed out" I heard a clank, and this arched gear piece, came falling out. Upon further investigation, it appears that the spot welds broke, and it came out of alignment with the gear on the motor (then of course, it fell off eventually).

Any suggestions?