This always worked well for me.
Have your machine shop cut a sturdy steel tube approximately 1" long and weld that to a piece of flat stock to create a cup. Then weld the shank of the 3/8 bolt to the center of the flat section of the outer side of the cup, now you have a cup on a bolt.
Thread that into the tiedown point and with the forementioned platform use your bottle jack captured by the cup to lift the plane.
Glenn Wilkinson
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