Step 5The Chin Strap
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The chin strap is actually a double chin strap. The four strings that come down are actually two loops. They pass through the toggle (the sliding spring-loaded clamp under the chin that holds the strings firmly. So that the loops don't accidentally pull back through the toggle, I ran the string through some silicone rubber and cloth "beads". It would be simpler to just have four independent strings coming down, passing through the toggle, and ending in a knot. I may modify that later.
To keep nylon string from fraying after you cut it, use a match flame. The fused ends of the string don't fray. They can even be shaped a little while the plastic is still soft, but be careful not to burn your fingers.