Mine was already configured for the spinnaker so I didn't mount it. However, you should mount it as per the design of the spinnaker. With the spinnaker hoisted and the tack pulled out completely, you should be able to grab the luff with one hand, make a fist around it, and rotate your hand 90 degrees before the spinnaker luff becomes tight. As a general rule of thumb, if your spinnaker hoist point is higher than 1/3 the distance from the hound to the top of the mast, you will need to be cautious to maintain mainsheet tension when the spinnaker is up. Our F18's are about 2/3 the distance up.