I know that this problem has been discussed here in the past (and pops up again and again on various non-Pentax Forum threads). I have yet to find a good solution to the problem and was hoping that there might be new knowledge on this issue. Here's the problem: I have a Gitzo G2272M pan head attached to the center column of an Induro carbon CX213 tripod, via a standard 3/8" thread. The pan head and center column are stuck together and no amount of manual force has been successful in separating them. The surfaces I can grip are narrow and I don't want to mar them. The tripod has never been subjected to water so I don't suspect water corrosion.
I've applied WD-40 penetrating oil to the edge of the surface where the two parts are in contact hoping that the oil will penetrate and separate the two stuck parts. It hasn't helped.
I'm aware of the suggestion to place the two parts in the freezer to get the metal to contract, but seeing that the tripod head has two built-in levels filled with a liquid (water?) I'm wary that the liquid might freeze and if the liquid is water the levels might even shatter.
I've attached a photo which I hope explains the situation (the pan head handles have been removed).
Would anyone have a suggestion that I might still try? Thank you.
(PS In my attempts to separate the two stuck parts I succeeded in snapping off one of the pan head handles but that's a lesser problem. I'll extract the broken off section later on).