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If you can not adjust vertical position of the jaws, try putting the hook in the vise further up the bend. This makes tying some things a little more difficult, but you can still get some of the benefits of a rotary vise. Also, it's not the end of the world if the hook isn't perfectly centered in the vise. It is still pretty easy to tie if the hook is only slightly off, but any big differences start to cause problems.
With the Nor Vise it is the same, it is a matter of positioning the hook correctly if you are using the regular jaws. Sometimes it is a bit trial and error for specialty hooks.