Product review (5 stars): Fixed the problem!
Our washing machine would fill, but not start agitating.  We used to be able to "firmly" close the lid and make it work, but it got so that it wouldn't even do that.  If you slammed it 10 times, it might recognize one of those and let the cycle continue.  I read some info online and determined that it was this switch.

The replacement was fairly straightforward, helped by some videos online.  The part fit perfectly, and looked just like the part we removed.  Once it was replace, the washer started working perfectly!

If you're having problems with your washer not recognizing the lid being open or closed, this is a great, inexpensive way to remedy that.