I have two 3-ft 4x4 pieces of wood and I would like to join them securely so that I have one 6-ft 4x4 piece of wood.
What's the best way of doing this?
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Slice them up into 1x4s then laminate them with a 1 1/2 foot overlap on alternating pieces.
That will give you a 6 foot 4x4 from two 3 foot 4x4s.
You'll need lots of wood glue, many clamps and either a good table saw or something equivalent.
The only other ways I can think of doing this involve spending more on hardware than a 6 foot 4x4 probably costs.