probably just a typo or a brain fart. BUT

If you have never stripped the wood off a Lee Enfield...



There is a square end to the stock bolt that fits into a square groove in the back of the fore stock to hold the bolt captive preventing the bolt from unscrewing and the butt coming loose.

If you were to crank on the bolt without first removing the fore end, you would cam open the slot spreading the back of the fore stock and the wood will split.

If you take the butt stock off first, you will then need to remove the fore stock to repair it.