Martini Henrys have a similar stock bolt / butt socket arrangements. My experience with Martini Henrys is life-long - I got my 1st licence to shoot a MH when I was 14 yrs old, in the green hills of Natal - entirely agrees with Peter's observations - stock bolts really don't unscrew themselves mysteriously: As Peter says... nor did they seem to work loose. And even if they did, usually due to dried out old butts...
So THAT explains why all of my rifles have gotten loose! Dried out old butt indeed!
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