My 1986 Hunter 31 has two organizers with two lines each, one starboard and one port. I want to add a third line to each side which requires either a new single line organizer or replacement of the double with a triple. The headliner does not allow me to see the deck from below so am not sure if the existing organizers are screwed or bolted to the deck. Does anyone have any knowledge of replacement of the existing organizers?