When my wife does the laundry, she puts my tsitsis in a nylon mesh bag to keep them from getting tangled. However, the knots still become loose. On closer inspection, I noticed that the final knot is what in Boy Scouts we used to call a “granny” knot, that is, an incorrectly tied square knot. A granny knot is easy to loosen. A square knot is easy to keep tight. They are both tied using two “overhand” knots, but a square knot is “right over left and under; left over right and under”. Can I retie the tsitsis using square knots? Thank you.