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I made a pair of jackstands in HS metal shop, back in the day. Still in use today and better than anything one can buy at Auto Zone, etc.
Cannot post a pic, because they are 3k miles away at the moment.
Basically, 2" etc. pipe, split three ways about two-thirds up from bottom. Spread into a triangle, reinforced with 1" flat stock at base between legs.
Internal, sliding pc. of smaller tube with saddle at top. Four (minimum) holes drilled both pc, round pin of appropriate diameter, with attached chain (lanyard) tacked to pin and chain (to preven loss of same) Pin used to fix internal pc at one of the four heights.
A boring project, maybe. Useful for life though. Wish i had made two sets.
Can post a pic in a month or so when i get back to where they are. For all i know, they are still offering said boring project in every class these days...no idea. It was a long time ago, ha ha.