Product review (5 stars): Way better than buying a new microwave!
My latch broke because the kids constantly slam the microwave door.  I was really upset thinking that I was going to have to purchase a new microwave, but after taking the inside of the door apart it was easy to see what part I needed.  DO NOT try to trick the microwave into working with a broken latch.  Very dangerous and this part was cheap enough.  It fixed the problem and it only took me 10 minutes.  After unplugging the microwave, I used a butter knife to pop the inside cover off the door.  The part slides up and down in a little channel.  Tension is provided by a spring that is attached to the part by a little hook with the other side attached also with a tiny hook on the inside of the door.  BE CAREFUL handling the spring as stretching it or breaking the little plastic hook on the inside of the door will make it much harder to fix.  All in all it was an easy fix and the part came fairly quickly.