In reply to jtpj777:
It's funny - the guidebook mentions that the loss of the tooth made the route easier. Personally I thought it was nails for E1, the 5c pitch of Zigzag Double Direct is probably easier.
Is the loose block the big thank god jug just before pulling round the roof (it's never looked that well attached?) or is it something else? If my memory serves me, there's also a slightly dubious long block just above the peg after you pull onto the wee headwall?
Was actually at Clova today on The Doonie and High Crag (it's a shame more people don't head up there as Centipod would be worth a few stars if some traffic got rid of the lichen)