I make my own pull-pull cables from the same stuff Dubro puts in their packages. Plastic coated stainless steel fishing leader. The tackle area of the sporting goods store will also carry the crimp sleeves. For tubing, I use whatever I have laying around. I only use the tubing for the fuse exit as that is all that is required. Nyrod, Golden rods or any of the multitude of clear "antenna" tubes at the LHS work equally well.

John