A reasonably good effort even though you measured in mm sometimes. Here is what I think you did, with a few observations. I may not have your procedure correct therefore have been misled by your pictures. You measured the O.D. of existing tube. .0862203 INCHES! Then a picture shows you "measuring" I.D. by using a .052 drill bit. Then you purchased tubing with .09375 O.D. and .06575 I.D. Approximate. We don't know the tolerances of the new tube and we don't know how much wear on the drill bit. Sometimes using the shank is better. Then it seems like you may have inserted an unknown drill bit into the end of tubing so as not to crush during chuck up in drill. Hopefully it was a no. 52 size bit. Then you are seen sanding the end of the new tube to .0862203 O.D. I do not know if the entire old tube was .086. You do not show measuring the portion that was inside piston. (It does look like it has a step or maybe just a mark). This would involve taking .00376 off of the tube. Then it seems you shined it up with steel wool? I do not know why you worked on such a long unsupported piece of tube instead of shorter pieces if you wanted extras. Mechanically you are after a press/JB weld fit and a proper remainder O.D. for parts interface. Your wall thickness at install end is now only .010. Flow wise, you are after same I.D. as existing. You are off there by .01375 or 25% larger. This could cause some kind of problem. Carb King will know. I know a scientist will appreciate this study. It shows I care about you and your carb. USA! USA! USA!

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn