Spring popped off after tear-down

hey I had the same problem just after doing a repair job and I figured it out, if you are still needing help I can send some pix of where and how its placed, actually a lot easier than I thought too. basically open the back, there is a hole in the part of the door that sticks through, and there is another hole in the metal frame holding the cards just near it (close to the battery compartment). sits a bit awkwardly but it works! :) hope that helps, you or anyone else.

Hey man, i just bought a wm-4 . And same thing happened. It’s the door spring. Look where the door hinge is and apply the spring in that door hinge hole and the hole next to it by the brown card. You are gonna have to figure it out how to do it. It’s pretty difficult to put back. But it’s worth it. Goodluck.

Hi! Were you able to fix this? I have the same problem and luckily I have the spring with me, it's just that I don't know where to put it