There's been a misunderstanding, the main capstone would have been on those big sidestones and maybe the middle one and the [supposed] destroyed backstone, but if you read what i first wrote you'll see i meant something was clearly placed on top of the chamber sidestones and the chamber backstone therefore sealing the chamber but under the main capstone, it's very hard to explain but so easy to see, try reading what i said again, i'm sure if you could see what i'm saying you'd see it straight away, I'd have love to have showed Roy before this new book because it could have helped him in regard to trethevy as they are very similar, to me Zennor proves that stones have been moved at Trethevy.