MetMo Piston
A palm sized pneumatic motion you can fiddle single handed for hours, the cutting edge of portable satisfaction mechanisms, using only air and your fingers to provide all the motion.
Experiment with an aerodynamic bearing, spinning the spindle allows a thin cushion of air to escape between the piston pin and the cylinder block for friction free spin, momentarily suspended in air.
So you can appreciate this unique satisfying motion reserved for use high precision measurement machines.
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