Vladimir, next time will be to develop, consider this option.
Outer beauty, of course, no(half an hour of work from scrap materials - I have something its not to sell), but much more convenient to handle. In valve built-in magnet on cover for cell phone(Oh, how loudly rustling Velcro in the silence of the night when you need a reprieve redraw), the mask metal U-shaped plate to which it adheres, it at the same time and the button presses check - in-the-dark search just slightly press all five fingers on the lower part of the valve. Sitting fee is good
Though I first just case the Board wanted to do, so it was easier to pull out/insert it from the mask(aka legs soldered clings struggles, and the cloth should be easy to fly if the pocket to expand slightly), and then decided that the mask is easier to make than in the old pocket is fine to alter. With a cover, incidentally, is also not a bad idea if the plastic cover on the Board not to do so.
say, after dinner harmful much to laugh - can be a volvulus to obtain 
