Alternatively, drop down from the top of the furthest away chamber from the main incline in the twll - it's in the far corner and the roof has been quarried away a lot less than the others so it's a considerably larger chamber.
It sort-of splits as you go downwards and you're aiming for the lowest part of the left hand side.
The tram level runs along the absolute bottom of the chamber (part covered by falls in most of the chambers) and if you follow this, it will bring you to the bottom of the incline.
This version basically avoids a squeeze but more of the route is in the open air.
Incidentally, if you're going into / out of the twll, there's only really one place to do it, opposite the second chamber from the main incline, give or take. It's a bit scrambly, but a lot better than everywhere else!
Hello again darkness, my old friend...