Nice guide. I had a sticking left corner button. I spryed some Deoxit Fader F5 on the bottom button and while cleaning it up the puck cover came off. So I lifted the left corner with a small jewelers screw driver. I got enough space to think about slipping the silicone cover and puck back over the switch. I put another jewelers screw driver under the bottom edge and slowly slid it towards the opposite button. I was able to release the first tab holding the bottom on without damaging it. I then replaced the silicone cover and puck over the switch and snapped down the tab. And now it works great again. Just a minute ago I did a search and found this information. Now I know there are 4 tabs along the bottom edge. I guess those years of working on car stereos and such kind of paid off. Did not know what was under there but knew to be slow and careful. Real lesson is to search and learn before you tinker. I was also very lucky.