From my dead seas scrolls file:
The text is dated 12/21/2014. As I have 65 and 66 Fastbacks, I don't know if it will work on later years. But it gives you an idea of what and how.
Jim
The text is repeated here:
Trunk Torsion Rod
Want to load the trunk hinge torsion bars in 30 seconds without broken knuckles?
The torsion bar should be in the position shown in Image #2 when ready for loading. Cut a piece of 3/4" square steel tubing 8 1/2" long. Drill a 5/16" hole about 2 3/8" from the end (image #3). Place the tit on the torsion bar into the 5/16" tool hole. The end of the tool is leveraged under the horizontal bar. Lay in the trunk, and rotate the tool in the direction shown in Image #1.
BOOM - done.