Here are pictures of the piece that broke off the de-coupler. I see that a Phillips screw attaches that piece of plastic to the coupler, but there is a spring or two involved. It would be easier to attach that little button if I could remove that plastic lever, but I've dealt with little springs before. Should I remove the screw, spring, and plastic lever?
Does the de-coupler work magnetically? There doesn't seem to be much metal in it.