In response to a query, I have uploaded how the extension pillar is attached to the top plate of the pier.
Photo 1 shows the pillar tube removed, leaving behind the bottom plug of the pillar attached to the adapter plate via the rusty central bolt.
Photo 2 shows the pillar plug removed, showing the adapter plate attached to the pier top plate via the four outer bolts.
Photo 3 shows the top plat of the pier without the adapter plate. The top plate is 250mm in diameter.
Hope that helps.
thanks
Bo
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