On Mon, 11 May 2009 20:53:49 -0400, in alt.home.repair, "David B."
When I did it for a living (so many years ago) we used hidden hangers,
little bracket jobbies that go inside the gutter, hook under the front lip
and over the back edge, then screwed into the fascia board. Very secure,
very clean-looking from the outside. Or we'd rivet straps to the hangers
(and rivet the hangers to the gutter) and run the straps into the roof if
the fascia wasn't suitable.
Here's one that looks about right (no connection, just saying):
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