Hazegry, the knob shifter is a doable thing but you need to remember that is some 3 or 4 inches of glass and the kiln cool down time is going to be a day long or more.
You might get it made with less hazard of cracking if you went to someplace with liquified glass in a crucible like Corning Museum of Glass or some hot glass shop.
Torching 4 inches of marble is not for the faint of heart.
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The Zombie Apocalypse is Upon Us.
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