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Next, the tool is placed atop the Lucite and clamped to the table, and once clamped, air pressure is blown into the bubble. Here you can see how the bubble is flowing up the restrictor and tapering off into a double-bubble effect. Once the Lucite reaches the end of the restrictor the pressure will be stopped and the bubble will have reached its full shape. As for the bubble on the Ultra, once the middle point of the bubble comes within 1/4 inch of 17 1/2-inch mark (the upper 2x4), the pressure will be stopped.