This article will cover how to secure caster wheels onto assembly plates, from butt end of extrusion and from the side using t-nuts.
Mounting caster wheels on the butt end of the extrusion
The plates and caster wheels each come with 4 screws and 4 t-nuts. In this case, you will need to tap the 4 pilot holes on the end of the extrusion with the provided tapping kit. Here is an article if you want more details on how to do this: How to tap Vention extrusions.
Once the holes are tapped, you can use the 4 provided screws to fasten the plate (holes shown in the left picture), and then screw the wheel onto the plate (holes shown in right picture):
Mounting caster wheels on the butt end of the extrusion
As for the wheels that are fastened to the side of the extrusion, the process will be similar but rather than screwing the plate into tapped holes, you will insert the t-nuts into the groove of the extrusion and screw the plate into these. You can insert the t-nuts through the end of the extrusion, or drop them in the side, as shown in this guide.