I recently purchased this 'quick draw' system made for Cabela's by Scotty.
http://www.cabelas.com/cabelas/en/te...=cat21300&rid=
I haven't mounted the base on the transom just yet, because I'm still determining the exact spot I want it. Ideally located where it will be very handy, yet will not interfere with any other items that need to be mounted on the transom. I have also modified this rod holder slightly so that it will hold the rod in place snugly while travelling at planing speeds.
I made this modification by drilling a couple of slightly ovalized holes on the bottom of the inner plastic cylinder & screwing down 2 small soft rubber stops onto the top side of the outer 1/2 cylinder (which the innner cylinder clicks into). I also added some very thin soft rubber padding to the inside top ofthe inner cylinder. When the inner cylinder clips into the outer 1/2 cylinder, the rubber stops protrude through the ovalized holes in the inner cylinder and press up against the handle of the rod. They push the rod handle against the padded ceiling of the inner cylinder and hold the rod very securely.