Thats if the crew is pulling the spi down Al ?, no free hands for the helm to do that as well when he lowers the spi!!
If of interest to anyone, I have kept to the bag stowage system as its is how I have sailed a Wayfarer for the last 15yrs and felt that one less extra thing to learn in a new boat was a good idea for me.
Its what we know but if your not sure about a spinnaker, the chute will give you more confidence.
CP