I suspect masts (with a grain(s) of sand) are the same as 2 white 20L buckets that are stuck together. You have to "break the seal" in the join to get them apart easily.
I had a mast stuck like this & it was really stuck.
A mate of mine put it under the water in the lake we were sailing in (about 30cm deep). I stood on the narrow (top) end. He had the bottom end and shook the mast up and down vigorously and pulled on it every so often as he shook.
We had it apart in about 1 minute with very little effort.
I was gobsmacked

(I tape the join every time now and have never had it stuck since).
He commented that he had seen 4 people on each end of a mast and they still didn't get it apart.

Da vecta's method is similar in his post 6 from the top of this topic.
Try it next time and you will be surprised how easy it is.