Thanks to the link to the manual posted by SAA, I was able to field strip my Husqvarna, AND put it back together again! It just needed me to get the feel on just how to wiggle & twist the barrel to get those lugs to slip in and mate with the frame.
I learned a few things;
1. it is a recoil operated design. I won't try to 'crank" my ammo.
2. The barrel leaded a bit with my cast bullets. I'll have to watch that.
3. contrary to what I thought earlier, a super case will NOT fully chamber, and yes, headspace is controlled by the rim. I will continue to make cases from "super' brass with a .403 rim diameter. I have a LEE case trimmer for 9mm Luger, and will chuck it in a hand drill to shorten them to .800. As I don't need a lot, just enough to make my 100 year old pistol sing on ocassion, that will do.
I also learned from a link sent by Lars, that Sweden replaced this pistol in 1939 with the Walther P38, only to switch to the LAHTI a year later, presumably because German stuff became unavailable. Both designs, of course, in 9mm Parabellum that could be loaded much hotter than 9mm Browning Long in a recoil operated pistol.