Valve pusher / hammer for the Hwasan -APS shell conversion, this is required as the original is too short to reach the centre of the shells. I personally have it in steel but I don't see why it wouldn't work in plastic, but I can't speak for the longevity.
Two required for the set.
Big thanks to James Smith on YouTube for creating this tutorial video on the installation and testing of this kit.
*Please be aware that if you would like to order this in steel, Shapeways has a 5% tolernace for the steel casting process, so you may have to file / sand the part to fit. Order part in plastic for best fitment.