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MILLER 2507 - FLUSH MOUNT ADAPTER FOR ROTATING SIGNS.
The base can either be mounted
below the surface of your train table, which requires a
1/2" hole. It can also be mount above the surface of
your train table, this requires a 3.25" hole to be cut in
the layout top.
Top mounting is easier to do and makes servicing the
unit easier should there ever be a problem.
The top plate measures 4" Dia. Comes with mounting
screws and instructions.