PICKING THE CORRECT SIDE
You can attach the leader to the right or left side, or the underneath, of your dressed hook or tube-fly. I usually connect the leader to the side of the fly that will swim closest to the home bank. However, the fly will still hitch, with a V-wake, when the leader is attached to the far side of the fly, achieving a different effect as it swings across the pool – it will swim almost broadside to the fish, with its head and the V-wake pointing more towards the home bank. This can be effective on pool tails. If you connect the leader to the underside of the fly, the fly will ride like a jet ski, which can be effective in faster, choppier water at the head of a pool where the angled fly is more susceptible to drowning.
Attach a normal fly with your usual knot, then add two halfhitches behind the head.
Attach a hitching tube-fly through a hole in the side of the tube. It should have a hole on both sides.