Quote:
Originally Posted by MrB
My experience is that warming threaded parts makes matters worse.
Aluminium (as do most materials) expand when heated.
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Depends on where and how you apply the heat. In the case of the unwisely bought SCT threaded diagonal which tended to lock up depressingly often (Which I have now converted to a refractor style setup as it irritated me nightly) applying a little heat tended to make it easier to unstick as the locking ring would expand and loosen, where the body of the scope having a much greater thermal mass did not heat up nor expand as much.
Show a mechanic a locked up fitting and the first thing they will reach for after penetrating oil (Which is obviously not an option in this context) is some heat.