I had a good chat with Simon from X Eng on Sunday. The 70 brake needed a little 'fitting' and some people had expected it to bolt on with Toyota like precision. When it didn't work, they threw teddy out of the pram and posted on some forums as to how crap it was. This resulted in a significant quantity coming back, un fitted, so he told me.
Incidentally, Ben if you reading, I'm not suggesting that you are in this bunch. I know how handy you are and how hard you tried. Not sure that ever found out quite why it didn't work on yours. He had started development on a 80 series but has scrapped that and will NOT be picking it up again. Shame, I'd have bought one too.
So we need to make our own. I like the spot handbrake thingy, but a bit concerned that the stroke on the lever looks like a lot. Maybe better to turn with an electric motor than an air ram. A diff lock motor would be ideal. As it has springs in it, it would be self adjusting with pad wear! Anyway, I need to mock up a back plate first and then see what scope we have. Fortunately, I have a spare T box in the garden so I could do all of this in the garage. Whoopee. Almost warm
C