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It's very important to vibrate all the bubbles out so you don't end up with any honeycomb voids. This form was propped up off the floor on some scrap lumber. I took the blade off the sawzall and pushed it against the form. (the rebar rack was set in place and screwed down to make the form stronger to withstand the vibrations. The rebar sunk until the wires held it in place, just from the vibrating)