During the basement expansion project we had to replace the support pillar towards the front of this area because the original post foundation was not deep enough. At the time I couldn't get (or make) an appropriately sized pillar, so I had to use a 4" x 4", and I was never happy with how it came out:
I always intended to replace the post once I had my cabinet saw up and running. The new post was made by ripping a piece of 2" x 12" doug fir into two (2) strips which are 4.75 wide. A piece of 0.5 inch thick plywood was then sandwiched between the fir and the whole thing nailed off. This gives a laminated post with dimensions 4.75 x 3.5.
I installed a couple of temporary supports which were shimmed such that a very tight fit was achieved:
Removed the old post...
And installed the new one!
Since the new post is laminated I could not re-use the steel T-brackets - the bolts would have bitten into the pillar's soft center. Instead I'm using a pair of smaller L-brackets which I can bolt into the "meat" of the pillar and the crossbeam.
To add strength I attached 3/4 inch thick plywood skirts to both sides of the junction with more nails than you can shake a stick at:
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