Your best bet is to use a different style of copper hanger. There are
a few types, depending on whether or not you have a flat fascia, or
molding. You screw a bracket to what you have, bolt a shank to that
bracket, and then bolt a half-round hanger to the shank. They are
adjustable and work well. The under-slate hangers are a pain, and you
do have to replace slate to put new ones in.
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