If you are getting new Moser axles, I don't think you will need to tack the retaining rings in place. In fact, I myself would not. Mine rings are not and I am pretty hard on my axles. I would only do it on old original GM axles.
Markm, I was lucky. I grew up in an area where the local speed shop and machine shop was somewhat nationally known and sponsored all manner of east coast and west coast racers (Frantic ford, Jim Lieberman). One of the men involved with the Frantic ford was Jim Fox and he was a machinist at the machine shop. He was a very quiet man but if he took the time to tell you something, you were wise beyond your years to listen and follow his advice. Those guys had dozens of work arounds for all kinds of issues. One time, when I was breaking my axles at the drag strip, they walked me through swaping in Chrysler 8.75 side and spider gears into a Chevy rear, and the two Mopar axles you needed to get at the junk yard to use for better axles. I was young and those guys were headed for retirement. So I was lucky enough to be the beneficiary of some of what they knew. So many of them are gone now and to some extent, a great deal of what they knew went with them.