What you need: - 10m of 5mm rubber tubing - 11 12m of 600 pound dyneema rope - Constrictor cord - 2 stainless stell float line plugs - these you can make yourself if you have access to a metal lathe or a stainlesss worker. - 2 x Small stainless D shackel - 2 x Large swivel - 1 x Strong magnet - 12m of thread or cotton - A small nail - Lighter/matches - Pliers, scissors, screwdrivers, etc.. Method: Pull rope through tube by first pulling thread (tied to nail) with magnet

I used the magnet off the back of a 'magnet-name badge'. It needs to be fairly strong, a simple fridge magnet will NOT work. Try a 'rare-earth' magnet from your local hardware store.

Have your cotton or thread positioned somewhere so it can spin and unravel freely. You want to have the least amount resistance posible. Tie the thread to the nail and put inside tubing. Using the magnet, work the nail & thread all the way to the end.

See the magnet is actually magnetised to the nail (right) as it pulls it through the tube.

Once the thread is through, make sure you tie the thread to the 600pound rope. Then all you have to do is pull the thread, ever so gently, and the rope will come through.

When you get towards the end it gets slightly more difficult as the cotton stretches. Be patient. Be gentle. Work it. Once you have the nail & thread out the other end, pull gently so that the rope comes through. You will want your rope (with no flex) longer than your tube (with lots of flex) so when it pulls on that big kingfish, the tubing stretches before the rope snaps tight.

As you can see the plug is the stainless piece of metal the rope is tied to and the D shackel is attached to. The trick is this. You now need to anchor one end of tubing/rope and pull the other. This causes the tube to stretch, swallowing the rope. When the tube retracts, it takes the rope back inside itself. This is hard work, use a lighter to gently warm the end of the tube, when you pull hard, it'll pull the plug into the tube.

The tube has swallowed the rope!

Use the same method as you would tying off your rubbers. Pull the constrictor cord knot tight over the tubing where the plug allows for it as pictured.

Now you have a lovely new float line at a fraction of the cost of a store bought one.