Aaron Buchholz is at St. Louisville Glass and he is demonstrating how to flatten a bottle shaped vase. The end of the blowpipe is first capped. Look and observe how the air pressure pushes back as Aaron applies pressure to the body of the vase.
Video-How to Make a Handblown Glass Mug
Thornville Backwoods Event
8572 High Point Rd, Thornville, OH 43076
http://thornvillebackwoodsfest.com/