This is my preferred method for a profile where I do not need one that can be twisted for adjustment. If you can find left hand 4-40 all thread you could make one twist adjustable. Hard enough to find right hand at a reasonable price. I prefer all-thread to formed ends because there is no stress on the thread from machining. Towards the end they stress putting the pushrod in a jig like vise to keep the air pressure from pushing the ends out. That is real.
If you can't find all-thread buy some long 4-40 or M3 metric bolts and cut off the heads. Put the cut head into the tube. Wrapping is easier with threaded insert since you can wrap the threads. Use Kevlar thread. You are not wrapping just to keep the bolt in, you are wrapping to keep the CF rod from splitting. If you want them to be twist adjustable, I use stainless steel L/R Studs. They are like the DuBro turnbuckles but much stronger - and cheaper - if you can wait for them to get here from China.
There are more on YouTube, and I think Sparky has one somewhere in his series.
Ken