Cleaned this up this morning.
.....and then you slap your left hand up the arÍte
What? That litte diagonal seam?
No, where all the chalk is
I'm not sure I can see what you mean
Where the rock stops being rock and starts being air
Can you tick mark it please
OK, there you go
I can't see those as they are disguised by all the other chalk
OK I'll put them 6" to the right
OK, so I go for the tick marks?
No, go 6" left where all the other chalk is and the rock runs out
OK, thanks, I think I've got that now