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Under-wedged clay is hard to throw because it is not ‘warmed up' properly and you could ‘pull a muscle'so to speak. Also, it's problematic because it allows air bubbles to remain in the clay. For example, have you ever had a nice cylinder pulled up high and you find an air bubble in the bottom? This indicates you have under-wedged. Try to pop the bubble with your penknife tool then smooth it over with a few pulls. This may not work and you will have to start over. If you find the air bubble near the lip, cut it off just below the bubble and proceed with some nice pulls. For best results and more enjoyment, take the time to properly prepare your clay - especially for throwing pots.