Quite new for stringing, searched but can't find a definite answer. I am confused with the starting knots, thinking why can't we just use normal tie-off knots. I guess the reason it that the holes reserved for starting knots are usually bigger than others, so we need a bigger knots? But by taking a close look of a HEAD racquet, the main tie-off hole is also larger than normal holes. Why normal tie-off works in this case? Also I remember I saw some video showing how to do cross without starting knot, but forgot if they use a different hole from the starting hole?