I used two part 5 minute epoxy that you can get at any hardware store.

Thanks for this information. I did it (had some two-part 5 minute epoxy in the garage already), and I've lived with it for several days now, and I really like it.

I did it differently than you did, though. I was afraid that having the bump directly on the button's center would eventually damage the surface of the button.. So I did four small bumps around the button instead. Works great.

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Tony Fabris