Then, I decided to take a spring from the PF13 of my Model F 122 to fix my M, and what could possibly go wrong, the F spring worked seamlessly on the Lexmark M. Until I decided to pop out the key stem once more... and when I did, the spring flew off and rolled itself into the innards. As I don't have a socket screwdriver, I held the M and shook it furiously like there's no tomorrow, but the spring rang and rang inside the shell and refused to come out.
I've sent a message to ClickyKB for a springs shipping quote to Canada and don't know if they will reply. If you have a couple of spare springs, feel free to contact me with p+s
