But both Mustad and Loop make a #4 short shanked, ring eye hook that work very well with tube flys. These two seem to be the 'choice' of most. Folks in Europe tend to favor using a small treb. hook. Hit Mark B's FlyfishingUSA site (he's a board sponcr.), pull up tube flys on his site and you'll get the hook info you need.
Here's something to think about. Scott Baker-McGarva, the President of the SSBC showed me some of his "non-tube" tube flies. Aside from being deadly looking, he used an interesting hook set-up. Similar to you he used a cut-off hook shank (though it was a straight eye), but rather than put on a tubing hook-holder he tied a loop of 50lb Fireline off the back of the fly and looped a small very sharp Red Gammy hook in the loop. If you've seen the standard salmon bucktail set-up, this is it. The only difference is that it is super-braid rather than heavy mono.
This is a great idea, especially for long flies - you can hang the hook wherever you want, yet keep a short body. As well, it allows the use of the many excellent short shanked octopus style hooks that are easy to find.
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