The reason why the screws keep coming off is harmonics. When you chop, or baton, it creates a vibration in the steel that resonates through the grivory. Grivory flexes when you tighten the screws, thus putting outward pressure on the hex head and nut. At the vibrations travel down the steel, the nuts back off. Blue loctite will allow the nut to stay on and allow you to remove them later, should you wish. The screws can be found at just about any local hardware or home improvement store, even in stainless, which is a good choice. The issue has been addressed with Paul Tsujimoto, the QA man at Kabar, and Ethan both. Toooj, Ethan and Kabar take alot of pride in their knives, as do we all.
If you should need new screws fromt the factory, please contact Kabar, and they will have them out to you that day, providing you don't call too late in the business day. Should you wish to take it upon yourself to resolve, the bolt and screw specs can be located in the FAQ. You can get replacement screws and Blue Loctited for less than $5 at Lowes or Home Depot.
Beckers are hard use knives, but they must be maintained as any tool must. I don't have loctite on my Beckers, they get used rough as hell, and I have never had a screw loosen, much less fall out. I maybe perhaps one of the lucky ones, but I overhaul my knives once a week and daily if I am outdoors. They get a mineral oil wipe down and a goin' over.
I hope you enjoy your Becker knives, they will last you a lifetime. Moose