Anglers can have problems with their tube flies not swimming well. this video explains why and how to deal with it.

When we start out tying tube flies, it's common for anglers to find that their tube flies do not swim level. As the fly swings into slower currents, the hook rides progressively lower. As a consequence, when a steelhead hits, we miss the fish. This video explains why and what is needed to stop that from happening.