Just this spring I read about leaving a long tag end on the leader when you tie on the tippet and tying one fly on that tag and the other on the tippet. I rigged that way on a trip to Bennett Springs earlier this month and it works great. I used to tie the second fly on a piece of tippet tied with a clinch knot to the bend of the first hook, and found that I got a lot of tangles and that very few fish hit the first fly because of the strange angle or appearance due to the second fly. On this trip I tied the tippet on with a double surgeon's knot and left a 6" or 8" tag end of the leader itself. Then I tied on a white mini jig to that tag and either a chamois fly or a pheasant tail as the bottom fly 12 or 14" below the first one. The mini jig worked great to get the bottom fly down deeper and still caught some fish and I had one double for a while. I had almost no tangles even roll casting most of the time. Try it once and I think you will like it.