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I made some “worms” with one end thinner, I gave them a wavy shape and attach them to the sword. First row of worms is the most difficult, when it completely hardens next rows wil lean against it so they will be easier to attach and shape. Last row (lower part) need to be smothen to the level of the blade. Worms that are touching each other may by melted together.
Thickness and lenght of the worms, number of rows depends on amount of spaceon the blade.