Back to The Welfare approach
Okay, now that the drawings are made available, lemme re-affirm my love for tweaking the M14 the WELFARE Way.....
Head down to your handy dandy Princess Auto Supply or your Kitchener-Waterloo Surplus (for you SW Ontario types). They always have these humungus wrenches for sale (about $ 14.00). Get one with 1 3/4" sizing and open it up slightly from 1.75" to 1.80" with a file or a grinder, whatever is easiest for you. I could swear that they are almost 24" long... Great leverage.
By the way, I've got to credit Lazerus2000 (CGN member) for showing me this cheaper way during our Abby M14 Clinic October 2004. He and I think along the same wavelength.... "Save your money" approach....
Just
DON'T (learned from experience) rush out and spend $ USD 60 from SARCO in New Jersey for an M1 / M14 reciever wrench like I did. By the time the shipping was paid, I was into the wrench for over $ 100. OUCH !
For you machinist or CNC or millwright (get yer hands dirty kinda) guys, here's whatcha do for the vise jaw blocks: Any 2 blocks of steel, about 1" thick (this ain't rocket science so I'm trying not to get technical) will do the job. I got my machinist buddy to measure the outer diameter of an M14 barrel and
SUBTRACT 20 thou for the "crush".
Then have your machinist buddy do the rest of the cutting... don't ask me how to cut it... I'm just the M14 tweaker.... not the tool maker.
That's it... The techniques for indexing and swapping barrels are in my M14 Clinic videos.... (I hope...)

I have not seen them, yet.
Hope this helps,
Barney