Buttons, button covers:
. . . . buttons can be readily switched out. There's a structural section and a cover. The cover needs to meet quite a few requirements in order for the whole assembly to work properly. I spent some time exploring options and looking at a variety of materials and shapes. I ended up going with a matching button (matching the surrounding top cap material) as a way of practically/physically meeting all the structural/functional requirements and I chose to "blend" the button rather than Kitsch it out. This, from an aesthetic standpoint, was driven by the fact that mod body materials vary greatly, and are intended to be the "main attraction". Furthermore, the way I have the button done, when one chooses matching caps of their own custom material, with my method, I can make the button to match the body and caps. My thinking was, that if someone got a wild hair, and wanted to fabricate their own button top, I could provide them with the structural elements, and they could fabricate/shape and apply their own.
Some of the requirements of the button topper are that it fit smoothly in the 1/2" hole surrounding it and operate smoothly like a piston in a cylinder. Also, that it never leave the hole completely when not engaged (again, you wouldn't want your piston running past the end of your cylinder). This requires that the button cap be hollowed out on it's underside. So, ultimately, you want a button cap that's <1/2" in diameter, 1/4" tall, and it's underside needs a 3/8" diam. hole that's 1/8" deep. Then you order a replacement stem/structure from me (or get one at the hardware store and machine one end of it down to < 3/8") and do your wackiness.