here's what I used;
Scotty Laketroller Post Mounthttp://www.amazon.com/gp/product/B001M4HSFI
One crank/revolution of the handle is exactly one foot of line. I used my fish finder to verify; sat in 20 feet of water, let out 20 cranks, the ball just touched the bottom. I did the same at 30, 40 and 50 feet just to be sure. If you want, color the braid every 10 feet with a florescent marker or some yarn knottted then super glued to the braid.
I mounted it to the side board on the left with a flush mount.
I replaced the steel cable with Spiderwire 80 lb braid for safety reasons. (If somehow the cable snagged, it could flip the kayak. The braid is strong but cuts very quick with a simple knife.)
I use a 4 lb downrigger weighthttp://www.cabelas.com/product/Cabelas- ... l+Products
Believe me; you do NOT need a heavier weight. The braid is much thinner and cuts through the water with less drag and at trolling speeds around 1.5mph there is almost no plane.
I attach the ball to the braid using the top eyelet. On the tail eyelet I use my flashers;
I then attach my fishing line about 2 feet above the ball and about a 4 foot lead.
On on line I use a dodger and 12" behind that, my lure.
This way, my line falls in line behind the blades attached to the ball and when I get a fish, I only have the dodger and my lure and not all the flashers to interfere with the fight of the fish.
Hope that makes sense.
I'll take some photos of my set-up and post later tonight...