Seldén Lazy Jacks is a mast or boom service fitting for compatible Seldén spar systems. A Lazy Jack system is an active aid for containing the mainsail when reefing and dousing. Our lazyjack system works exceptionally well with fully-battened mainsails, but it is also very handy for use with conventional sails. We can supply complete lazyjack kits , either. It is intended for replacement, maintenance or completion of the corresponding original spar assembly. Because Seldén has used several mast and boom sections over many years, check the existing component, section profile and fixing dimensions before ordering. Where an article number is shown, use it as the primary identifier and do not assume that a visually similar fitting from another spar section will be interchangeable.