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Your mortar might well be a thin finer sand pointing layer,
with stronger, (more cement), larger sand/grit mortar 2/3/4mm behind it.When drilling the holes for the screws/coach screws/etc you choose
aim to be under the height middle of each brick you drill into.
Those old bricks don't have full scale modern frogs,
but you want to minimise the chance of the fixing bursting the brick.
mespilus
hugo7
90yo bricks. Seemingly solid enough.
Morter is a bit crumbly.