An Armourer's Perspective: .303 No. 4 (T) Sniper Rifle and the H&H Connection

[Beerhunter]

The tool that I am referring to Peter is the cylindrical one with a central pin for holding the central screw steady while locking the outer ring. It's not easy to use but far from impossible and does get easier with practice.

BTW, I've PM'd you about an entirely different gun.