KORG Volca button fix

A simple fix for rubber buttons on any KORG Volca.

The most common reason of broken buttons is the deterioration of the conductive coating on the silicone button. This thing needs to be placed inside the button. There it will serve as the basis for the conductive layer.

I came up with 2 ways of using this fix.

**Method 1** (conductive glue):

1. Print it
2. Sand the bottom surface
3. Paste some conductive glue on it (i.e as shown on the picture), wait until it dries.
4. Place inside original button
5. Assemble and use.

UPD: Since the method above didn't last long for me (perhaps I just got a bad conductive glue), I came up with another one:

**Method 2** (foil):

1. Print it
2. Sand the bottom surface
3. Paste some glue on it (I used PVA glue, works fine)
4. Press glued surface to a piece of foil, wait until the glue dries a bit
5. Cut off the excess foil at the edges and poke a hole in the center (for LED)
6. Place inside original button
7. Assemble and use