a affordable way is to get a pack of 3mm threaded Traxxas remote control car tie rod ends, some carbon fibre arrow blanks from an archery shop and some 3mm thread bar or allen headed thread rods (with no head) and epoxy the parts together - lucky to be $20 for 3-4 rods at different lengths.

https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR12.TRC2.A0.H0.Xremote+control+car+tie+rod+ends.TRS0&_nkw=remote+control+car+tie+rod+ends&_sacat=0

these type of rods are made commonly for delta 3d printers, I have a bunch but all at a fixed length (tube cut at 180mm) otherwise I could of helped.