A small brass swivel, when properly used, is a very inexpensive and efficient way of keeping a fishing line in good condition. Besides side casting, curls and twists can appear in a line from many causes. These can be quickly alleviated by the correct use of a swivel.
The swivel must be on the line, above any rig or attachment to the line. That is, the first item on the line, after it passes through the rod runners is a swivel. It must be as small as practical.
Suggested swivel and line combinations:
- No. 14 swivel – up to 5kg line
- No. 12 swivel – up to 5-8kg line
- No. 10 swivel – up to 8-15kg line
- No. 8 swivel – up to 15-20kg line
While the sizes may seem small to some fishermen, they are manufactured from a brass wire with a diameter in excess of the diameter of the nylon monofilament to which they will be matched, and consequently have a far greater breaking strain than the line.
Many Anglers use a mistaken theory that a large swivel will perform better, however, in practical use it is just the reverse. When light lines are matched with heavy swivels, there is insufficient strength in the line to cause the swivel eye to spin freely, and a build-up of twist occurs in the line.
Similar trouble exists when the swivel is fouled with seaweed or sand, or has been allowed to become corroded and hard to turn. Using a swivel under the lead sinker as a stop on the line will also restrict its action, and this rig should be avoided, unless a second swivel is attached to the line in a workable position.