In an earlier contribution to this discussion,
Roger Mills wrote:


An alternative may be to make 6 cuts with a smaller circular saw - 3
on each side of the slot from both sides of the post and the bottom.
This woudn't go the full depth in the middle - so you'd have to
finish off with a handsaw and then use a narrow chisel to remove the
remaining material.


Another thought . . Do you have access to a band-saw? You'd need to support
the posts horizontally, and have some means of guiding them onto the blade.
You could then make 2 cuts defining the width of the slot, and chisel out
the bit in the middle.
--
Cheers,
Roger
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