Large areas of my 1930's house need raking out and repointing. I can't imagine how long and arduous a task raking out manually would be, but a carbide mortar rake in a small angle grinder makes it (relatively) quick and easy to take out about 1" of old crumbling mortar. In a strange loaves and fishes kind of way,
it also seems to produce a greater volume of sand than the volume to be repointed. Shamefully, I have to tell you that this is "after" rather than "before" - I'm still learning.
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Haven't yet found a need to take a cutting disc to an old frame, though, and hope I never need to, but it seems like the tool for the job. Get one, you know you want to; it's far more versatile than an SDS drill, even one with a non-rotating hammer action, fun though that is.