It is basically just adding a few strands in the loop ends before you start to twist it up.I think it helps to make a quieter string by making the loop ends a larger diameter by filling the string groove better.I just run string around by bow square about 12" long.Like when I making a 12 strand D97 I'll add 2-3 extra strands in the loop ends,making it 16-18 strands in the loops and 12 strands in the middle.I'll pad with the same string or dacron.When I make a 6 strand 450+ I'll add an extra 4 strands per bundle of B50.I have always padded loops on FF and other low stretch strings.