THIS IS ONLY COMPATIBLE WITH THE SUPERNOTE PUSH PEN
I decided that I wanted to try this mod before realizing that the Push Pen internals were different because I leapt before looking. So I had to get creative and make it work anyways. You'll have to remove all of the white and clear plastic from the body. The piece highlighted in the third picture, you need to carefully cut off and leave the nipple of the underlying piece of plastic intact. There are little nibs on it that hold the white cap in place, you can trim those to make it a smooth shaft and then pull the white cap right off. That nipple is then inserted into the cap piece and superglued in to place. As you can see in my model I didn't let the superglue fully outgas before reassembling so there's white residue.