Cool. Thanks so much for taking the time to go through all that.

I misspelled the word "hole." I spelled "hold" by accident. On 8-8-12 at 15:52 you said to punch or drill a small hole in the piston of the qev. I didn't understand what you meant, where you meant, or what it is for. I'm just starting out with a qev myself and would like to make any modification ...

Brian,

"No.
Without the mod you do.

It will enable the valve to reset rapidly after the pilotvalve closes.

This means you can get multiple shots out of a single reservoir as far as the QEV is concerned."

Can you explain the hold in the cylinder a little more, maybe add a picture or something ...

Looks very nice. Do you have any idea what velocities you are reaching? What is the barrel made from and what diameter did you go with inside the barrel?