OK, remembered to take a few photos last night. Hope this makes things clearer.
Firstly, here is the stock setup we are trying to emulate (sorry, very difficult to get a decent photo under the stockie at the moment):
The theory is that the lever provides mechanical advantage in just the same way one uses a long wheelbrace rather than a 8" spanner to remove stubborn wheel-nuts. That's my degree in Backyard Engineering showing
Now for the practical element (also very much Backyard: be warned, this is not pretty. Faecal's a daily driver, not a show car.)
I led you astray saying that the adaptor from the days of the four-speed was still in use. It must have got the flick when I put the 'glide in (more than 10 years ago). What I have now is a massive rear gear-box support with a hole drilled in it as the pivot point for the central handbrake lever (as it shall now be named...)
Here's a view from the driver's side:
As you can see, moving this aft has meant the stock front hand-brake cable is now too short. When it needs to be replaced, I will look into obtaining something marginally longer.
And from the passenger's side:
With the adjustment available at both the front and rear cable, you've got some margin of error getting the lever angle correct. And as you can see, my setup is functional if unlikely to win any awards. I'm sure you'll be able to come up with something with equal utility but far more attractive.
Hope all that's some help. If anyone has any suggestions on getting my speedo reconnected and accurate with stock speedo head, trimatic and 13" wheels, I'm all ears.
cheers
RET