The Mast Base I received with my new mast (last fall) from Ballenger is the same with the exception that's it's the newer style that is pinned internally with a single bolt. It looks like the 4 bolt diamond pattern is identical with the only difference being the anchor inside the mast either being the aluminum block that's fixed by the 4 bolts Bill mentions or the sleeve that's anchored with the single bolt. I'll upload a pic of my base area.

:: Not sure what exactly you are asking about, but I added
:: some pics of mine in a new gallery called, cleverly,
:: Mast Base. I think this is the original set up. There is
:: a tombstone shaped shoe that fits into the mast and is
:: secured by 4 screws through the mast wall into the shoe.
:: The tilting mast base unit then bolts to the shoe with 4
:: screws.
::
:: I try to remove the base every year and clean it up
:: because the base of the mast seems like it would be a
:: very harsh environment. It was a bear to disassemble the
:: first time but is pretty smooth now. The shoe had some
:: stripped holes, so I have re-drilled a couple to the
:: next size up and re-tapped. I use LanoCote as an
:: anti-seize when reassembling but I know others swear by
:: other products.
::
:: Bill
::
:: :: Hello,
:: ::
:: :: Does anyone has photos of their mast base, on deck and
:: :: inside the base of the mast section?
:: ::
:: :: Ballenger explains some sort of tubing (square tubing
:: :: about 2" x 2.5" with 1/8" wall) that is apparently
:: :: screwed onto the stainless plate and into which is the
:: :: section is simply in place with a bolt going through the
:: :: section. This allows a little play considering the base
:: :: of the mast always rocks a little.
:: ::
:: :: I need photos to better understand the mod.
:: ::
:: :: Thanks!
:: ::
:: :: Jerome