In this picture you can see the juntor link with the plate and polyamide part. This part is covered with the fiberglass fabric in order to keep the curve shape. As weel there are two holes where are put the plate pins.
Here you can see the pins that are put in the polyamide part. As well the holes for the screws M1,6 X 4.
You can see the adaptation of plate to polyamide clamp. The holes are where the screws are screwed to the case back. This clamp is made by 3D printed with 0,5mm less of volume what allows to put the fabric on it.