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Just to add to my own post after talking with a friend he suggested that the problem probably happened due to long time exposure to moisture in the steel / concrete joint. This he said tends to form an ironstone like cement between the two materials.
He suggested two things
1 Raise the pier foundation just a little above the level of the concrete floor of the rest of the observatory so that any accidental moisture intrusion due to weather or condensation will not gravitate to the central pier area.
2 Lay a waterproof barrier like tar paper or oromond between the pier base and floor.
Seemed like reasonable suggestions so passing them on.
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