I get hives on my hand when they rub their wet nose on it . I also sneeze often around them . The hives is the most obvious clue . <| sep |> The wizard of oz . The flying monkeys . The general sense of weirdness and hopelessness in the film . I still hate that piece of shit . <| sep |> I looked into DIY flex drive before I started looking into this . The bit problem is dealing with hysteresis on the flex cable itself they tend to work kind of like a spring . That ' s why early attempts to do it using off the shelf flex cable systems like the Dremel one didn ' t work they ' re not built for reversing , so you couldn ' t do retraction . I believe both Flex 3 Drive and Nimble use custom made flex cables plus gearing on the hot end to get around this the hot end is geared enough that you can run several revs of retraction to unwind the cable . If you had a gear system similar to that , it might actually be possible to use the Dremel one off the shelf . I have also done napkinlevel designs for other variants . One I considered was using actual bowden cables of the sort used with bicycle brakes . You could have something like a car cam shaft on each end to do a rotarylinearrotary conversion with 3 cables . The efficiency would be horrendous , although that ' s not really our biggest concern here rather , my biggest concern is if you could make the hot end side rugged enough to deal with the forces on the cams without being excessively heavy .