There is a local archery shop that are extremely good people that I know. I ended up finding out that the pieces from arrows that need to be cot to length, the leftovers the are mainly throwing out. Also arrows that get a small chip will be piched by guys shooting in the league so a good 24 to 29 inch section is salvageable from extremely strong. The other benefit is it is accurate on being straight to .003 which would make it awesome to replace, upgrade, or scratch build pieces for the 3d printers or cnc stuff. I was even going to buy some ink pen/ mechanical pencil inserts to make some slick writing sticks. I will have the threaded insert aluminum ends for screwing in linkage.
If I remember right the delta group was looking to use carbon fiber rod. The shop has a professional carbon rod cutting jug as well that can be used for our stuff if needed. I will likely make a linkage set for my delta I need to build still. Shoot me a message if you are looking for stuff in particular length and diameter wise. Strength wise the support the weighted point/broadhead and can handle 340+feet per second, and for use on hotends or even spacers the thermal brake potential is awesome.