All the HW rifles I've owned just used the flat style washer. Try the Loctite method as I described which is working great on my D34.
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I was off work today and went to the hardware store first thing this morning and bought a tube of Blue Loctite. Put a bit on the threads of both screws that go in through the trigger guard and both forearm screws. I let it set for about an hour to an hour and a half....then started shooting. It appears to have worked pretty good. I shot around 100-150 cycles and the screws stayed put. This evening I took all the LocTited screws back out and cleaned the threads. The reason for this is that I had prefer to let it set for 24 hours or more after applying it. I also wanted to see what kind of mess it would make of the threads. I don't like it. The loctite hardens in the threads and is very hard to clean out. I was hoping it wouldn't be that way for future tear downs. But........I don't see any other option to keep them from working themselves loose.