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Replacing the button is pretty simple. You can finesse it out with something like dental floss (wrapped around to grab the button), or just brute force it by drilling a small hole, insert a screw, and pull. (I went with the brute force method and think there are pictures in the "How-To" sticky.) Like some others, I sprayed the new button with clear semi-gloss before installing it. I used Rustoleum, but I expect any good brand would do fine. It's not the most abused place for wear, it just has to protect against the salt in your hands.
I don't know, I think you missed out on a great start/stop button mod. Leaving the start/stop button with screw in makes it so that you no longer scratch the button or get it dirty. It also makes it easier to reach and instead of using one finger you can use your whole hand to push it in.