Great rules, all seem to be true. However I've thrown out my big sheet of cardboard in favor of those foam rubber interlocking 2ft x 2ft floor tiles. You can knell on them too. 
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1977 911S Targa 2.7L (CIS) Silver/Black
2012 Infiniti G37X Coupe (AWD) 3.7L Black on Black
1989 modified Scat II HP Hovercraft
George, Architect
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