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I found the centre of the glue block and mounted a 3" diameter aluminum face plate.
Photo #4: Centering and mounting face plate to glue block.
With the faceplate attached I mounted the assembly on the lathe and dressed the face of the glue block flat and true, using a few passes with a bowl gouge and following up with a sanding board, which is just a straight, flat piece of wood with a piece of 120 grit sandpaper glued to it.
Photo #5: Glue block mounting face dressed flat and true.