The Estes instructions say to use a ball point pen and ruler to make three firm passes over each fold line.
I didn't want all that ink on the cardstock. In older instructions I remember a recommendation using a ball point pen that has run out of ink.
The illustration shows a shorter wooden or plastic ruler being used to emboss the folds. I'd recommend using a metal ruler.
Instead of a pen, I used a butter knife with a rounded tip. There are some serrations on the knife, but not at the tip. Use just the tip of the knife to emboss the fold lines.
This technique goes back to the original Estes Saturn 1B kit. You can read it on Page 8, Step 23A of the instructions at Jim Z's: CLICK HERE
Cut out the fin slots first -
Then cut the outside border line of the skins.
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