On my recent salmon trip to Russia, we swung weighted tube flies like the one pictured above. The advantage of this pattern is that the brass tube body sinks quickly and evenly. Unlike a cone-head bugger or another weight forward fly, this pattern doesn't dive nose-down in slack water. It sinks flat, and is consistent when you're sweeping a run. They're pretty simple to tie. And when you fish, simply thread your leader through the tube, and tie on a hook, which snugs into the flexible plastic sleeve at the back of the fly. They're easy to switch, adjust, and so forth.