For those who have made or worked on these before - what material did you make the throttle shaft out of? I was contemplating using drill rod. Worst case if I fall flat on my face trying to make one - I could buy a shaft worst case, but where's the fun in that without trying first? Besides money's a little tight as my previous employer decided that my job could be done better in China (rotsa ruck with THAT) Drill rod is cheap - not sure what'd it cost to hard chrome it or if I really need to right away. EDIT: Or should I just stick with TGP? or? We'll see. Thanks for everyones comments - I think I learned alot so far.!