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deleted
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Don't know how much movement you'd get but with our freeze/thaw cycles I'd build a bit of flex into the post side of things.
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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.
withered_preacher
mespilus
Washers would be essential, I'd be concerned about fracturing the bricks, or potentially applying a lot of leverage to then end of the wall via the post and breaking the mortar bond.
What does the wall look like?