The stopper knot is at the tail ends of the spin sheets where they come through the blocks that are attached to the clew of the spin. To make it 2 to 1 you pull the tail end with knot through the block and attach it to a jam cleat or V cleat near the block by your shroud or rear beam. You must release this before you jibe. The blocks attached to the clew do not seem to get in the way of the snuffer. I made a pigtail for the blocks and made one side longer than the other so the blocks would not foul each other.