I place a loose-leaf binder reinforcement over the mark to limit how far the Mylar can tear. For extra reinforcement, place a small square of tape over the binder reinforcement. This will reinforce the point where the bow is tied to the sail. This will be the lower bridle point. Then push a needle through the sail at the yoke line points.
Care has to be taken to get beneath the bow.
See the sail hole detail. Thread a line through the cover where the bow crosses the spine, and tie the bow to the spine, leaving the knot at the back above the bow. Tie the line to the bow. Thread the other end of the yoke line through the other hole. The yoke line is now ready.