The sheath is very robust. It has a unique kydex knife fastener clip that firmy holds the knife in place, and two handle straps. The bottom strap was very tight to snap around the handle until i adjusted the sheath a bit. With the kydex clip i really doubt the need for the straps. The thumb clip is a positive locking 'click when the knife is put away.
The LMF is my primary knife as well. In case you missed it, we were actually discussing some of Gerber's "shortcomings"
here last week.
I see from the attached photos that the black oxide finish on your pommel looks about like mine did when I first took it out of the box -- perhaps Gerber wants everyone that sees your knife to think that you've actually had it for several years and have used it to break through a helicopter canopy.
You'll find that no matter what you do, the retention straps will never loosen up to the point that they ever function as they should. I tried several methods to get them to the point that I could actually close them with one hand, including soaking them in water and then closing them over the handle (which I had temporarily made larger with a sheet of cardboard) but alas, I finally gave up and used the knife to cut them completely off.
As you have already discovered, the integral retention clip on the sheath is more than adequate, and I enjoy the knife so much more now that I can actually use it without the fear of others convinced I'm afflicted with
Tourette syndrome seeing me fumble around trying to secure two retention straps that were designed a half inch too short.
Jim