Back when SIR was selling the 8x57 conversions, I had just got one and a fellow walked into my office with a paper bag.
Inside the bag was a Vergeuiro bolt..... in pieces.
There were no manuals available, nothing in Small Arms of the World and I did not yet have TBSA-1909.
I fretted and fumed with that thing for about an hour and then SPANGGG!!!!! parts everywhere.
Finally figured it out.
It is MARVELLOUSLY EASY.... once you know the trick!
It is like playing with a Rubik's Cube for the first time..................