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My version of the foam sandwich
The drawings suggest that you make a "foam sandwich" to hold the three tubing lines apart from each other. I decided to put some self-adhesive 1/4 inch super sounding on the bottom fuselage skin and under the center console cover, not only for soundproofing, but to gently hold the tubing in place and prevent vibration. I am putting 3/8 inch Polyethylene tubing around the 1/4 inch brakes and nothing on the 3/8 inch fuel line. I found the 3/8 inch Polyethylene Tubing at Lowes Lumber and Aircraft Supply. This will keep the lines from touching each other while being held by the foam soundproofing.
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