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To get the leverage needed I have a 1 3/4 in wrench with the box end cut off. I slip a big pipe over the end of the wrench to make a cheater bar. 1 13/16 inch wrench is for Garand receivers.
 
I tried the wood barrel vice using ironwood. Should have been hard enough to clamp in without being destroyed. All that happened is that the whole assembly turned in the wood "vice". I am not a fan. Went out and bought a barrel vice from Brownell's. Your best bet might be to try to get a clinic going up in your area. M-14 Doctor is in 100 Mile House or thereabouts, not too far from Calgary. You get tools to use, you get experience, and you get fun and socializing.

PS I've never seen them turn out with just pressure. You have to give the wrench a good whack with a hammer to break them free. This is probably considered a "Bubba method" by gun smiths. :)
 
My barrel vise is made from two 1 1/2" square steel bars, each with a semicircular 1 1/2" cutout for split 1 1/2" diameter aluminum bushings. The bushings are made as needed, bored to size, then split. The blocks clamp together with 7/8" bolts. I sprinkle resin on the barrel where it is grabbed by the blocks. Pulled up hard, barrels do not slip. I would not be too optimistic about wooden blocks clamped by a machinist's vise.
Open end wrenches are widely used on M-14/M-1 receivers. Haven't heard of one being spoiled. I prefer a contoured wrench, fitted to the receiver.
Sometimes you cannot have too long a cheater on the wrench.
 
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