OK, here is the tool inserted on the left side of the cluster.

You want to insert it here or below, to catch a series of ridges which are molded into a lip on the edge of the cluster.

(you can see the ridges better below in another shot)

I made the mistake of trying to use the tool further up on the cluster, and it didn't hook on anything. I kept fiddling and eventually determined the right place to hook the tool.

Attached Thumbnails