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The button is not only too big, but too round. That's going to roll out of someone's mouth if they try to clench it. I saw one similar to this at the show and the chamber geometry was goofy. This one looks similar to what I saw there, but I can't see it. Make sure you're using a parabolic or rounded chamber shape, not a V-shaped chamber.
The only other thing that's glaring at me in this one is the lines on the side. It looks like they were buffed too hard and the stain came off on the edges more so than the rest of the pipe.
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