Yes I used MDF and I glued and screwed it to the old post, 1 on 3 sides and the other 2 on all 4 sides.
I’m not finished yet, it needs a couple of small bits adding on the bottoms and a bit more filler before she gloss’s. With newel caps on I don’t think you would notice if you didn’t already know. Excuse the orange light.
Not a criticism but "if' you had access to a table saw, you could have made the edges at 45 degrees but too hard to do without.
I doubt a hand circular saw would be accurate enough unless it was a tracksaw
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