Easy to use obviously LOL. The only thing I changed after first use was how the cord attaches to the base of the mouthpiece. You mistook it. I ruined a lot of shots because the camera strap got in the way. Thread the string through the base in the other direction so that the strap comes out at the back of the mouthpiece. It won't interfere with the shot. Also the first day I tried it my jaw got a bit tired but the more you use it the less tired.
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