In reply to chris smith:
Hi Chris - thanks for checking out the blog!
Great point - I hadn't realised that! I've dropped one in now
We took a big bunch of wallnuts (double and sometimes triples of the smaller sizes), one set of offsets, and one set of offset brassies (All DMM).
I think we'd both agree that the offsets make up 90% of your nut placements, as many of the cracks in Yosemite granite are punctuated with flared pockets. The aluminium offsets felt amazingly secur, and I would have happily dropped a couple of wallnuts off and taken an extra set of offsets.
And for their weight, you may aswell take two sets of brassies too! Every weird greasy flared pod will take a brass offset somewhere - they're absolute lifesavers (especially if you're too scared to use your cam hooks).
As for clean aid practise - this is a great idea before you head out. We mentioned here a couple of the routes we aided before going out:
http://dmmclimbing.com/knowledge/big-wall-dreaming/
We were based in North Wales whilst we trained, and found the best place to practise was on the slate - lots of clean cracks, occasional bolts and plenty of choss to deal with. If you're around that way then let me know and I can recommend a few good routes to have a go at. If you're more towards the peak district then consider a trip to Millstone! Plenty of short cracks littered with flared pods - just be careful you don't end up hogging something classic on the embankment (go on a horrible day!).
There's routes to practise on wherever you go, but ideally you want a nice clean crack with plenty of gear, and easy to setup a toprope on.
Shoot me an email (contacts now on the blog!) if you have anymore questions, would be happy to help.