Tie rod?
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I thought abought having a set made where i work. I am a CNC Machinist but i run a mill and that dont work to put OD threads on a rod. The next problem i had with building them myself was that i had no idea what type of material they used. If you make them from to hard of material you run the risk of bending or breaking something else more expensive, too soft and they will bend real easaly.