This is just an idea you might want to pursue further.
I haven't tried it, so proceed with care!
I think you probably can make the height adjustable if your uprights are 1-3/8" fence top rail. Here's an
UNTESTED idea you might be able to adapt for your purpose, starting from a post I just saw for modding the legs on a DIY tensahedron stand that was made from the same fence rail material.
https://www.hammockforums.net/forum/...=1#post2004233
So, it seems that 1" emt will fit snugly onto the swedged end of 1-3/8" fence top rail, and when taken apart the 1" emt slides into the opposite straight end. His goal was to break down the legs into shorter slide-together sections to make a more compact bundle for transport. Good idea, and maybe can adapted for adjustable leg lengths on your Spurtle. I don't have a piece of fence to rail to test the 1" emt slide-in fit, so I'm just going on what he says!
If the 1" emt is sufficiently snug when it slides into the straight (not swedged) end of the top rail with very little wiggle, then I think you could use it to make your Spurtle legs adjustable. That is, cut each Spurtle leg into 2 sections (I don't know the physics of where the cut should be for max strength when joined. Middle??) and cut a section of 1" emt that will slide in between the 2 sections at the new cut.
Drill a hole for a locking connector pin (can't recall its proper name -- the kind with the wire across it) all the way through the top rail on each end, a few inches below the new cuts. Also drill some holes through the 1" emt in strategic places to adjust for your desired length(s), and secure the new sliding joint on both ends with locking connector pins. (Or you could pop-rivet one end of the emt into the stand leg below the cut, and slide only the upper leg section to adjust the height.)
I'd allow about 4" length of 1" emt at each end inside the fence rail (so an 8" length of emt will connect the 2 leg sections together but will not add any length). Make the extension longer at your own discretion!
I can think of a couple other ways to do this, but IMO they're less secure.
To repeat: This is just an idea you might want to pursue further. I haven't tried it, so proceed with care!
I hope this is a helpful start. Good luck, and if you succeed (or even if not) please report back!
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