Do you know who Tom Morris is?

CB

Or put more politely -- check out Tom Morris, he's got a forum in the Vendor's Corner section.

Or make your own.  I started by buying used arrow shafts from a local archery shop for $1 a pop, then just bought a bunch of 6mm tube from a kite shop (I can't remember which one, but it has "wind" in the name -- that should narrow it down!).  I turn end-pieces that fit just inside the tube; with a 6mm shaft there's room in the end-piece for a clearance hole for a 4-40 socket-head screw.  I put epoxy on the screw-head, screw it tight into the end, then epoxy the end onto the pushrod.  It makes for a nice, good-looking, permanent end.  I haven't had one fail yet, in several aircraft -- the ones in the pictures here have over 500 flights on them; I've got other aircraft that have suffered multiple crashes with no damage to the pushrods or ends.

That is exactly what I am looking for.  I have a stock of target arrow shafts that I use for jigs, spars and fuselage stiffeners in profiles.  Since I use Morris controls I have never needed one for a pushrod.  Not sure but I think they are actually lighter.  Where do you get your LH bolts and tap?  The arrow shaft is thick enough that you could make a tiny strap wench to do the adjustments and that solves all of my problems!

I suppose I could still use the DuBro turnbuckle and make the shaft with 2 RH receptors.  FYI - he last post on the Tom Morris forum was in 2016.

Sorry -- I was going lightly on the definition of "turnbuckle".  I just use RH thread on each end of the shaft, and remove the ball end from the horn to make adjustments.  I feel this is better, because in the unlikely event of a water landing the pushrod turning, it'll back out of one end just as much as it screws into the other.  I was going to send you to McMaster-Carr for stuff, but they don't have much LH stuff that small -- although they do have one LH 4-40 screw, if you dig for it.  It looks like MSC has left-hand dies but no screws, they should have suitable-sized drill rod and left-hand taps to match.

You're right, it's not really pretty, but if as you say it's on a profile, then a double ended turnbuckle is not really required, as you can undo the ball link from the horn, and give it a turn to adjust it. If you're worried about putting undue stress on the pushrod, you can grab a section of threads with pliers or put a set of double nuts on there. A half turn of the ball link is not as coarse as you might be thinking!

Simple is good!

Hobby shops and Tower Hobbies carry parts for RC cars, namely tie rod ends.  They come in various lengths and most are titanium.  There are some 4-40 but most are metric.  M3 is about right.  I've used them a couple of times.  They are a little pricey.