We usually do not respond unless their are pictures
Having said that ; after testing what your orginal mortar is
begin stabilization in sections; so you do not weaken the whole wall with
your cutting.
Now if your back up orginal mortar is just sand ;
test by flushing the wall with water and see where it all comes out...
Then it may be a candidate for Lime grout injection
If it is just soft yet crumbly mortar it may be fine to repoint with a
hydraulic lime mortar to match what I am guessing is the original...
...but rake back more than 1" to fell comfortable......Lastly American
Heritage lime works is giving a hands on workshop in the Chicago area Aug 15?
this invaluable workshop ( and ones like it ) is necessary for all craftsmen
and architects of 19 cent buildings ......maybe someone on the list has more
details ..Best Michael
--
To terminate puerile preservation prattling among pals and the
uncoffee-ed, or to change your settings, go to:
<http://maelstrom.stjohns.edu/archives/bullamanka-pinheads.html>