How many flying clamps do you need for 50/50 stringing? It seems like 4 clamps would be necessary--2 to hold the mains, and 2 to hold the crosses. If this isn't the case, either there is a clever way to get around the issue of holding all the strings in place, or I don't understand 2-piece 50/50 stringing correctly. If 4 clamps are needed, what are some good choices for an additional pair of flying clamps? I've seen a recommendation for LaserFibre on this forum; any other recs?