Interesting to hear about other ppl's experience with warping. I have some metal combs that I bought 20+ years ago that haven't warped at all (i.e. I have them

Interesting to hear about other ppl's experience with warping. I have some metal combs that I bought 20+ years ago that haven't warped at all (i.e. I have them on the table in front of me right now and they are lying perfectly flat).