It always amazes me that people whine so much about 'shocky' glass and then I watch as they take a cold rod and wave it rapidly up and down through the flame..shock, shock, shock, shock!! How could it not shatter? It's just been heated and cooled over a many hundred degree temp change repeatedly in a couple seconds.
Take the rod and place it above the flame way way out at the flame tip. Slowly introduce the rod into the flame while turning it still way out at the flame tip. Gradually bring it closer to the working area of your flame. A few rods/glasses will shock under any condition but this method will stop most of the shocking shocking.
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