Are you saying that the stone that i say seperates the 2 chambers [or the backstone of the big chamber] touched the capstone, if you are - it never did or could as it's far to short and is nothing like the old drawing [maybe george could explain this to you better than i could], that's the thing it's down the road and i've spent lot's of time there and if you're saying that you've clearly forgotten the place, now if you can work out what was resting on that said stone, and something certainly was you'd be on to something, i can't explain it any better than i did, like i said it's simple and genus by the builders, and is so clear on site.