I'm the one that had to cancel out on that great trip you guys had last week. I'm leaving this upcoming Monday to go up there anyway and I've been using a product similar to this: http://www.cabelas.com/cabelas/en/te...con&hasJS=true
I bought mine about 3 years ago and they have really sharp hexagonal 1/4" screws that really, really grab on everything. Looks like they changed the spikes to tungsten carbide spikes and upped the price by $30 from what I paid.
Anyway, hope to see your images one of these days.