Wish I could help but that route shut me down!! I would love to know how many ascents it has had and what grade people think it might be.
I know the route was done in the 80s by James Holbrook and Mikl. Mikl was climbing superbly (as always) in the 80s and I saw James climb a few times and he was excellent on thin technical climbing. Other wall routes done in this time seem desperate aswell (Butter Knives, Bill Collins and Gidget Verdon) and I think the wall climbs are gradred very hard compared to the steep stuff at Berowra.
While we are talking about Berowra sandbags am I the only one who thinks Cenotaph Corner is tough for a 4?