Face masks must be tight against the face to make sure the virus does not simply come around the mask. Sometimes the strap of a single strap face mask is too loose. This device is placed against the back of the head with the pegs appointed outward. Run the strap through two pegs, then wrap the strap around and around the pegs until the strap is tight.
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Inventor, software developer, author of several books on Arduinos and one on 3D modeling
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