Thank you for the suggestions and thank you for tolerating what is probably a ridiculous question (I feared ridicule). I couldn't figure out if it was broken or what because it wouldn't go in on the left side. After fiddling with it I noticed the two sides were at different heights. The side (stabilizers?) of the switch have two different heights depending on where you put the metal clip. I pulled the clip out entirely, leveled the two sides to match the height of another switch, and put it back in. Ta-Da!