A month ago in my edition of Hemmings "Classic Car" there was an article testing many different stuck thread rust penatrants (i.e. WD-40). The best test performance was found to be a 50% mixture of transmission fluid and 50% of something else that is commonly found in auto parts stores. I discarded my magazine copy and don't remember what the mixture was. Did anybody read that article or remember what to mix 50% with transmission fluid? Of 10 penatrants tested, WD-40 I think was 5th.