Well, of course I had to do a tribute to this kind machine too! I already invented this machine, so it should work the other way round too (pushing the girl’s head instead of pulling her collar). Ariel was the lucky test subject this time. She was very patient while I tried to figure out the correct configuration. It turns out we had a few problems with the ring gag, so this first video is without a ring gag. But still… it is a great scene! Very exciting to watch Ariel’s head being moved. It’s not perfect yet, but I will get there! I just need more test subjects for my machines! 
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Maybe a gag tube is better instead of a gag ring. This way the device would slide more easily. In any case, very interesting.
What is gag tube and how it will work.
Well, in the text he seems to imply that the ring gag made it difficult to move in and out of the silicone dildo through the ring of the gag in her mouth. I have thought that a gag with a small tube instead of the ring, about six or seven centimeters inside her mouth would facilitate this movement.
Nice thought