Steelhead Addict - Here are some thougths from a veteran spinner builder:
I use both siwash and trebles. I like the siwash because they don't snag as much and don't do as much damage to the fish. But I've also lost many more fish with them. I've never lost a fish on a treble but often both the fish's jaw and hooks are mangled after I land it. If I'm after steelhead, I'll use the siwash hooks because I always C&R (sometimes I'll keep a hatchery brat). If I'm trying to fill the freezer with fresh coho, I use trebles.
Avoid using nickel or chrome blades for winter steelhead. You need something that has a brighter flash, such as silver plate or 24K gold. Nickel/chrome has a very dull, almost black, flash underwater. Jed Davis states this in his book (ad infinitum). I agree, up to a point. There are times and places when nickel/chrome is effective but fishing for winter steelhead is not one of them. I use silver plated blades exclusivily for winter runs. I usually go with #4.5 or #5.
For coho, I use either an flo orange or charturese blade and a silver body. Usually a #4 if the water is low or clear. If it's off color or high, go with #4.5 or #5. I heard some folks do well with blue or green blades but personally, I have not. But since experimentation is part of the enjoyment of fishing, try anything.
Mor-Tac fishing tackle is probably the best place to get spinners parts since Pen-Tac went out of business several years ago. They're at
www.mortac.com Best of luck.
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MSB