>>7005488Those threads couldn't be molded so either tapped before assembly or with the screws. Would account for the sparse threads. As far as the dude making them in Japan, I think he owns or at least has access to a CNC lathe to make the screws himself. He also makes these
https://www.12zigen.com/%E3%82%A2%E3%82%A4%E3%83%86%E3%83%A0%E7%B4%B9%E4%BB%8B/fa-g-%E3%82%BF%E3%83%B3%E3%82%AF%E4%BB%98%E3%83%93%E3%83%BC%E3%83%A0%E3%83%96%E3%83%AC%E3%83%BC%E3%83%89/