Well you asked---got a pencil???

really everybody has given good info and one tip i would add would maybe get/keep around some small tubing that the i/d is tap drill size for rod ends--example--If I remember---1/2 tube .083 wall i/d is tap size for 3/8-24 thread---clutch linkage, brakes, etc. another thing--I wouldn't allow a piece of welded seam tubing in the shop---have strictly a/c 4130 or Mild DOM but no welded seam!!!!!and no , I don't do mild steel anything but do a lot of 4130 and stainless

And pick up a cataloque from a supplier---they are full of teck info, weights, etc