Out of curiosity has anybody tried this double-square: http://www.leevalley.com/us/wood/pag...936,42941&ap=1
It looks like a cost-reduced version of the Vesper, which makes it interesting even though I have the Vesper. The main cost reductions seem to be:
1. Body made of SS instead of hardened O1. It won't wear as well as the Vesper, but it should be loads more durable (and therefore dimensionally stable) than cast iron, and also rust-resistant.
2. No rotation stop in the locking mechanism. This is a very nifty feature on the Vesper.
3. Lower precision. 0.003" over the length for the LV, vs ~0.0005" on my sample of the Vesper. To be fair LV's marking tools usually beat their specs by a fair margin, and I haven't seen a spec for the Vesper so I don't know how typical my sample is. Also 0.001 in/in is BS 939 class B, which is pretty typical for modestly priced squares.
All in all it looks like a really nice everyday tool.
Anticipating an obvious comment/criticism: That basic design has been around for ever other than the rotation stop, so it's not like LV is knocking Vesper off