Have found a draft I would like to try but am confused as to whether I would need to use 2 shuttles or 3? Draft pattern calls for shuttle throws 1 and 2 to be treadled on same harnesses - first throw is combination of treadles 1 and 2 - 2nd throw is also treadles 1 and 2. Third and fourth throws are treadles 3 and 4? Two different colors used in draft. For example, shuttle 1 has dark color, while shuttle two is light color? I know there must be a tabby thrown in there but am confused as to whether I would then have to use a third shuttle for the tabby? Or use the opposite shuttle to throw the tabby? Found the pattern in the Handweaver's Pattern Directory, page 35, second draft on the page? It is a Hopsack draft? Thanks for any help in advance. God bless. Merrymac