I don't have a stainless steel tank that doesn't leak, including three Nikor tanks, a Simmons-Omega, a Tundra and several Taiwanese specials.
I have found that the tanks, lids, and caps of SS tanks are not interchangeable so I have scratched a mark on the members of each set. Keeping things together greatly reduces any leakage. Kindermann style plastic lids also work very well.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.