Attaching a sink tip to a fly line is essential for fishing in deeper waters where you need your fly to sink quickly. Here's how you can properly attach a sink tip to a fly line:
1. Start by stripping about 6-8 inches of the coating off the end of the fly line to expose the core.
2. Take the looped end of the sink tip and pass it through the core of the fly line.
3. Pull the loop of the sink tip over the end of the fly line and then pull the tag end of the sink tip through the loop.
4. Moisten the knot and pull it tight.
5. Trim any excess sink tip material.
Make sure the connection is secure to avoid losing your sink tip while casting or fighting a fish.

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Topics covered in this question:

Fishing Gear Fly Line Sink Tip Attachment