I really liked excelon's idea of a soda bottle adapter for the Dremel threaded collar; however, the Dremel 4000 has coarser threads than the two variants in excelon's thing. So, I pulled some threads from liyanage's Dremel 8220 thread adapter and combined them with excelon's PET bottle threads. It's a tight fit and doesn't screw on all the way, so I might try to scale it up a percent or two and see how that works.
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