I finally had a chance to field-test an experimental PMD emerger I dreamt up last year. I started getting tons of strikes and eliminated the refusals I was seeing before I tied it on. I landed a mess of fish on this fly yesterday evening. CDC Bubble-back PMD Emerger Hook: #16 TMC 2487 Tail: Pheasant Tail Rib: One strand of pearl flashabou, twisted tight into a thin cord. Body: Pheasant tail Wing Case: Pearl flashabou, enlarged loopback Under Wing Case: Natural CDC Thorax: Peacock Thread: Black The idea is that the bubble is an enlarged loopback of pearl flashabou, with CDC under it as a loopback also, tied so the ends stick out like legs... this "bubble" traps a ton of air, resulting in a fly that just floats with the bubble in the film. It works great, is visible, floats when dry. But the real proof was in the pudding, tons of strikes and fish landed when they were being finicky and showing many refusals to other patterns.