Prepare the following parts:

4x y_end_caps

8x M4x5 set screws

Engage 2x M4x5 set screws into each of the y_end_caps, on the side with the 2 holes, until they are flush, as shown.

Sometimes, you may hear a "squeaking" noise, while screwing the set screw in. Insert the shorter side of the hex key, into the socket, to get more leverage, to reduce this.

Place one y_end_caps in each of the 4 corners of the Y axis frame. Make sure you orientate them correctly: the single mounting point must be on top.

Tighten each of the 8 grub screws to secure the y_end_caps in place.