I have two flues in my chimney. They are unprotected at the top.
Swallow type birds will arrive with spring, and resume nesting in the
chimney.
At the top, the flues are almost flush with the mortar chimney cap. I
purchased a couple of screened "chimney caps" at the home repair, but
they need an inch or so of exposed flue in order to mount correctly.
Should I break the mortar, exposing more of the flue, and then
remortar?

thanks,
bill in forest va