thanks! it feels just slightly choppy when you turn it compared to the others. when I run it, it just sticks and stick while the others run fine.The 2312's have 2 black prop studs and 2 silver ones. The 2212's just have a black and silver dot on the top of the studs.
The magnets in the motors make them feel what could be described as choppy. Does it feel different than the others? If the screw got into the windings and damaged them, I think it might be toast.