The gas cylinders we use are often incapable of inhaling because of the looseness of the cowhide bowl, which makes people feel inconvenient, even after the repair, it feels reciprocating. According to experience, I replaced the cowhide bowl with an O-ring (see picture), and then modified a piston to drill 6 holes of φ3mm at the bottom end of the piston. When the piston is lifted up, the O-ring seal moves with the piston bottom surface, and air enters from the gap between the upper part of the cylinder and the piston and 6 holes.
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