One of my “go-to” flies is the rubber legged Copper John. I’ve used this fly very effectively while fishing deep trailing a wooly bugger or when covering the surface layer trailing a large attractor dry fly. In most cases, the fish will hammer the Copper John fly rather than the attractor fly in front of it. The Copper John is a stonefly nymph imitation. One of the reasons why this fly is so effective is that its heavy weight gets it down quickly to where the trout feed. Try it next time you need to get down to where the trout are.