Ground again

[Bill Bryant <bryant@sonic.net>]

Still chasing bad grounds....
I find on my TR3b an unconnected ground wire dangling near the fuse panel
and control box...it has 2 black wires crimped together in a terminal that
is has a hole for a sheetmetal screw, but I do not know where it is supposed
to screw to the body...the only hole in the firewall nearby is the one for
the fuseblock and the 2 for the control box and I don't want to make a new
hole.

Where is this supposed to screw to?