This afternoon I grabbed my WM-F2 to play a tape, but first problem is after opening and inserting a tape, the door got jammed by a diagonal placed lever. I have resolved it after discovering the door shell popped out of the frame holding it.

Then I tried to press play, but the buttons won't stay down. Tried all the buttons but all won't stay down. Lol when I use my finger to hold it down, all functions works as it should.

The only situation where the buttons do press down is when the door is opened. But right after I close it (hitting the diagonal leaver inside) the buttons are depressed.

Anyone have a clue? Is some particular part worn out or broken?

Yay, fixed it. Took it apart unscrewing lots of tiny screws.

I noticed the pin was bent and it is a lever with a flat tin plate atached to it. so bent it straight. Now the buttons stay pressed.

Furthermore I fixed my dd-10 by getting out the rubber from the center gear and flipped it to use the inner side. Now it runs perfect, only it's still noisy like a turned on generator outside. Did reduce a bit by turning the plastic torque screw.