I bought this as I was intending to use a big SCT on the EQ6, however I ended up with a little baby reflector so I don't need it - will piggyback insetead.
The big dovetail itself cost $135 and the twin side by side mounts were $90 each. They are very, very solid and have great build quality.
Actually never been used for 'real' just to admire
In brand new condition.
Located in sydney, pickup is ok or I can post interstate.
$200.
Picture here ;
http://www.gavincato.com/tmp/IMG_5748.jpg