It cant be siezed in the chemical sense. So it might be worth trying to get some WD40 or similar onto it and let it soak.
WD40 will not damage the epoxy holding the carbon fibers together.
I pretty sure epoxy has a low coefficient of thermal expansion too. So if you can heat the seat tube a little, it might help some.
Other than that I dont know of any tried and tested methods. :(
@Smallfurry started
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It cant be siezed in the chemical sense. So it might be worth trying to get some WD40 or similar onto it and let it soak.
WD40 will not damage the epoxy holding the carbon fibers together.
I pretty sure epoxy has a low coefficient of thermal expansion too. So if you can heat the seat tube a little, it might help some.
Other than that I dont know of any tried and tested methods. :(