System AA Battcar Track & Accessories Track is extruded from high-grade 6061-T6 aluminum and Hardkote-anodized for a hard, long-lasting surface. 3817 track mounts to mast using a unique slug system that allows mast-up installation. For masts without internal sail track, attach 2707 Micro traveler track by drilling and tapping the spar. Join track sections with splice links. Order one per track section. Order one low-beam endstop (sold in pairs). Mounting Kits and Endstops Mounting kit slugs are available for flat or round mast grooves. Order one kit per track section. Use screwpin endstop to easily remove cars and mainsail. Order one kit.