Mainsail luff slider systems minimize the friction of sail slides when hauling the main sail up the mast.   All of our systems have provisions for capturing the forward ends of your battens if your using a full battens in your sail. These systems work well with conventional batten sails as well.  Any of these systems will fit internal or external track systems.

Mainsail luff traveler, slider systems by Harken.
Strong Track system by Tides Marine reduces friction allowing main sail sliders to easily.
Strong Track system by Tides Marine