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I'm finishing up a 7.5" Polecat Thumper (5 x 54mm motors) with a 30" extension, to fly it with cluster motors it's going to take about 5# of ballast. I'm thinking about pouring some two-part foam in the nose cone and when it gets a little mushy add some steel shot to it. It would probably take 3 or 4 pours to get it done. Has anyone out there done it this way?