Sanwa's latest addition - the OBSCM clear 30mm hole plug finally allows players to neatly display artwork after removing the original buttons. Artwork is securely held in the a clear button cap, pressed into place via a white install disc.
Artwork Installation and Removal
To insert the artwork, place it art side down into the cap. The white install follows it - make sure that the side that displays a number is facing out. Carefully push the disc down in between the slots; don't push too hard, or the tiny tabs on the disc will break.
To remove the artwork, carefully insert a 3/64" pinhead screwdriver just under the install disc. Push the disc up and out of the cap.
Actual diameter for artwork is 20.7mm (thanks to jPenguin of 801 Mods)