Hi Phill made some 5oz Bank sinkers for a charter boat at Whitianga. When the boat is anchored against the tide the current takes the line of those fishing toward the back of the boat so they use a sinker with a clip to add more weight but the light clip soon rusts. I mentioned those Jara sinkers said that they would be ideal as you can slip them on the line without having to take the other sinker off or cutting the line.