The top jig is for placement of track the appropriate distance from an NTrak module's sides. If the track is long, the jig will snap onto the track for proper cutting.
The bottom jig locates all tracks the proper distance from the front edge of NTrak or TTrak modules with the proper spacing.
If the module has a front overhang, use the jig on it's side.
This jig is a combination of NTrak-Edge-Lay and TTrak-Lay with NTrak-End-Lay