Originally Posted by
FBinNY
If I were snooty, I might point out that a seat tube with a wall thick enough to tap 3 full threads might best the best argument against bothering. (but I'm not)
I have a vague memory of Sheldon writing about securing a bottle cage to a steel frame with sheet metal screws. If I remember right, he thought it was an OK solution, but I don't think I'd want to try it.