How to make a QEV/piston valve (explicit)

A explicit video about how to make a 1/2 QEV and 3/4 piston valve.
Useful links:
How to make a semi-auto airgun (version 1 and 2):
http://www.youtube.com/watch?v=RKpeHUsa5vw
http://www.youtube.com/watch?v=t6ja7UMEkyo
How to make a good piston:
http://www.youtube.com/watch?v=yzwVMbNKPK0
How to make a simple pilot valve:
http://www.youtube.com/watch?v=u1IWLj-NL_Y
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Видео How to make a QEV/piston valve (explicit) канала wyz2285