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Sven Yrvind fabricates blackout and insulation plugs for the windows of his small cruiser using elastic foam, cutting holes with heat-sharpened wooden edges to create a needle-like tool.▶ 0:03 The technique — heating the wood edge until it stiffens into a point, then pressing it through the foam — produces usable plugs but with inconsistent results: some holes came out too large, others misshapen.▶ 0:48 A second problem emerges when pre-cut blue foam plugs turn out to be the wrong size; the windows share the same exterior dimensions but differ internally, requiring a new set to be made from scratch.▶ 2:32 He also notes that zinc bags used as bedding block sunlight inadequately and need additional yellow paint to cover them.▶ 2:32 On launch timing, Yrvind states plainly that setting no launch date is the better strategy, because surprises accumulate and simplifying the build rarely speeds it up — reality consistently outlasts the plan.▶ 3:20

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