Just made some pictures of my spi setup, but as it is an old fashioned analog camera it takes a little time before i can post them.
I can add that it is a mid pole snuffer, have 3 patches in the spi and since a roller is in the ring, friction is reduced so 3 in stead of 2 patches is no problem. The advantage ofcourse is that the bag doesn't have to be that long. In my setup it stops right in front of the beam. The bag is the same they use on f18 boats, and is just a little longer then needed.
The bag is connected relative tight to pole and beam, trying to avoid as much as possible windage and slapping through the water.
Mine has a combined hoist/tack line, but yes, one could be faster with seperate lines, it's getting popular over here.

Geert

Taipan #186