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Got to keep repeating this until some of the more slow types try it and find out it works.
What you are doing by heating the thing up is to break any locktite bonds, or other bond that may have formed due to disimilar metals or rust or whatever. You are NOT trying to make the case grow more than the stud, as it is impossible, due to the intimate contact between the two. To accomplish this you heat either the case or the stud to a point where the bond is broken. This cannot be achived with propane, it just dosen't make enough heat.
I prefer to heat the stud. the reason is that it turns color when heated enough, the case does not. If you melt or ignite the case you are Screwed. If you heat the stud until it just turns red in the daylight, thats enough, more than enough. Let it cool, and then the stud will back out without any effort.
The reason this works is NOT due to expansion of the case vs the stud at least directly. There is a difference in expansion, the difference will break any rust bond, if its locktite, it will carbonize the locktite and it will no longer hold anything, in any case it will come apart.
YOu can improve this method by first heating the stud untill red, and then squirting penetrating fluid on the threads. This will improve the disconnect, if thats necessary, and lube the thing as well.
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