I find some shrink tube often straightens when the hook is attached to a PVA mesh bag, using the line aligner with the line coming through the tubing eliminates this problem. This ensures a consistent turning of the hook.
The assembly method is simple, try the following:
1. Attach the hook with a simple noknot.
2. Cut the hooklength slightly longer than required.
3. Cut a short length, about 10 to 15mm, of soft rubber rig tube, 1mm bore diameter, ensuring that 1 end is cut at a 45 degree angle.
4. Using a baiting needle, pierce the tubing just below the pointed angled end, and push the needle through the bore.
5. Pull the end of the hook link through the tubing.
6. Push the tubing down over the hookshank so that the hair exits opposite the hookpoint, on the back of the shank.
7. The tubing should be orientated so that the line is exiting through the tubing on the inside of the hook.
Hope this of some assistance.