Many newer Z-Spar Mast Sections feature an
Internal Track Receiver Slot(s) extruded into the forward side. A variety of special Add-on (Insert) Tracks (
25mmor32mm wide) are designed to fit in these Slots, for use with low-friction Slide Rod or Ball-Bearing Cars. Normally a factory-installed option,
This was copied from Rig Rite.On my particular there is a cover plate on the slot.I'm hopeful this can be used to install the car.
Thanks Rick