Originally Posted by SchockT
Spinnakers are meant to fly outside the fore triangle, so the halyard should fly from a point above the forestay, whereas a genoa halyard exits below the forestay. Also, spinnaker halyards fly from a floating block to allow for the multi directional loads they see. A genoa halyard runs on a fixed sheave that only works on the fore-aft axis, and side loads can result in excessive friction, chaffing and even halyard jams. You may get away with it in light winds, but it could be problematic when the wind pipes up and you really want to get the chute down! You can use a spin halyard for a genoa, but you should NOT use a geny halyard for a chute.
Nah, its fine, check this out:
Jim's Scampi 30 MK-IV Site - Helios | Demystifying Scampi Sailboats!
Scroll down a little to see the mast head picture. The cage on the front of the mast there allows either halyard to be pulled forward or to either side with very little friction. This is standard Kenyon design for an Evelyn 32, a nice light, fast sport boat. I use this rig on a Scampi 30 and it works quite nicely.