Stew-Mac has a nut material they call "slip-stone", and right there in the description, it says " made of Delrin". If it's Delrin, then why give it another name ? Ok, maybe there's a good reason to give it another name : To make someone like me think maybe it's some special kind of Delrin, that is hard to get/impossible to get from any other source. Anybody know exactly what is is ? Is it just regular Delrin I can get from an industrial supplier or plastics company ? Stew-Mac is throwing me off pretty good because : They say it's a "new material " (but Delrin has been around a long time) Theirs is a cream white color, whereas regular Delrin is more white ? (and regular Delrin also comes in black, which Stew-Mac doesn't have, and you'd think they would have "slip-stone" in black too, if it was available).