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Here is a good source for clamps that I use for setting the blocks. Grizzly cataloge pg 377
http://www.grizzly.com/products/4-Claw-C-Clamp/H5747
I like the split surface on them. Works great with a lexan pad.

I've seen those. Do use one or two when doing the glue up?

I use 2 per block

I have a couple of those. I got mine at Lowe's (as I recall). Mine are made by Bessey, but look identical.