11.   The new mortar might hold the brick for years.

12.   The new mortar will grab thse nails like crazy and will hold on for dear life.

13.   Then surround the tube with mortar as you put new mortar into the joints.

14.   Use a cold chisel to clear the way for new mortar.

15.   When I fill them with mortar, would driving small anchors into the sound concrete help hold the new mortar?

16.   With the mortar out, dampen the joint and put in the new mortar.

17.   With luck, you can chip out mortar around a loose brick, and insert new mortar, just as you did when repointing.