I have one bit of advice regarding the middle of the spin pole.
I attach the middle of the spin pole to the bottom of the jib's roller furling. To get the best pre-bend, I attach it as close as possible. Unfortunately, I found that attaching the spin pole directly to the sides of roller furling bent the furling casing inwards, causing the roller furling to not work as well. It jammed. Therefore, I now use a small turnbuckle as a spreader bar. I use a short cord to attach my spin pole to the middle hole of the turnbuckle. Using the middle hole prevents the cord, and hence the spin pole, from slipping side to side. I then use two other short cords to attach each end of the turnbuckle to the sides of the roller furling. I use the shortest cords that I can to keep the spin pole as close as possible to the bottom of the roller furling, and thereby enable lots of room for a good downward pre-bend. I have found that this setup does not impact the performance of the jib's roller furling.
I would post a picture of my configuration, but I just took off my spin a few days ago (when I had to replace my broken main halyard).
Here is a picture of the style of small turnbuckle that I use. There is nothing really special about this style, I just happened to have one, and it met my needs.
http://www.ebay.com/itm/STAINLESS-STEEL ... 2108677976Also, remember to wrap every edge or point around the roller furling with some sort of tape. These spins rip very very easily. Wrap everything that is within reach of the spin. I have five new rips from just this season that I need to patch.