how to adj trunk lid tursion bar

[spfd]

Can anyone tell me how to adj a trunk lid tursion bar for a 1967 mustang fastback with a single tursion bar? It looks to me that I may have to sacrifice a digit or to! Im hoping there is a tool or a trick that is safe and easy. Any and all help will be appreciated.
Thanks, John.

 

[other_shoe]

I'm not sure that there is a way that is safe and easy.

There is an old thread about it: http://www.stangnet.com/mustang-forums/threads/trunk-springs.678266/#post-6870609

 

[2+2GT]

There is no adjustment on the 67 fastback decklid torsion bar.

 

[other_shoe]

Oh, yeah, I didn't notice he said fastback.

 

[spfd]

It looks like this.