I give the fish ample opportunity to take a plain fly; if they register no appreciation of my lofty ethics I add a tiny spinner and do it shamelessly.
From " Fishing with Floating Flies."
From " Practical Dry Fly Fishing."
The spinner for fly fishing should be small (sizes o, 1 and never larger than 2) and preferably of the kind with a patent snap that permits instant changing of flies. Ordinarily the single blade type is as much as one can handle easily on a fly rod.
The dark finishes, copper and black, are for very clear waters; the nickel, brass, gold and silver for waters that are normal or roiled.