Before cutting out the pieces, score (emboss) down the fold lines.
This "butter knife" method goes back to the old Estes Saturn 1B instructions.
Emboss a line down the fold lines using a knife tip with no serrations. On this knife, the rounded tip is smooth.
It's always hard to cut the tight launch lug relief hole curves with a hobby knife.
TIP: Start the center with a small punch. Continue down the curved side cuts with your knife.
TIP: Sometimes cardstock folds can crack the ink on a home print.
Keep it to a minimum by gently "coaxing" the fold. Don't do a hard crease at first. Work up to a sharp fold.
Apply light white glue to the tab.
Butt up the corner lines and burnish smooth.
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