Laser 2 Spinnaker rigging

[Jefferb]

Hello

In the rigging instructions for the Laser 2 Spinnaker, it says to pass the downhaul part of the halyard through the lower patch in the Spinnaker and pass it though the upper patch.

In another rigging article it suggests the following:
Rigging
The downhaul should be led up the inside of the sail through a small shackle on the lower patch - this helps reduce friction and prevents the sail being pulled through if the stitching works loose.

What do you attach the shackle to on the lower patch?

Thanks

 

[Twister]

I don't know about a shakle, but the system that works for me and i have seen on many other boats is a loop of line tied to the botttom gromet that the retrieval line is fed through