My top bar is made from a piece of Ipe (super dense tropical hardwood) salvaged from a piece of decking. You can use anything that is available. The wood is threaded for the plunger so the stronger the better.
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Cut the wood to 2" x 7 1/2".
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Drill two holes in the ends just like the ones in the base. Place them 5/8" in from the end and centered on the width. Same dia. as the holes in the base.
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Drill and tap a 3/8" hole in the center.
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Sand the wood and lightly round the edges and corners so it feels good in your hand.
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Apply a coating of mineral oil.