INSTALL Y MOUNT CHASSIS ONTO EXTRUSIONS - Build 2 of these assemblies.

Install two Y mount chassis onto Extrusion with no taps using M5 x 10 SHCS, M5 Washers and M5 T-nuts.

Take note of the direction of the Y mounts, the tall flat sides must face each other.

The location is not important at this point. Snug them down just enough to not slide around during the rest of the assembly.

Have you assembled 2 of these?