The cheek rest was never actually designed for the No4T. It went there by default! It was made and designed for the high telescope mounted P'14's and Sgt Cooper at the sniper school tried the idea on the first of the production No4T's. It suited them too so the idea was submitted, approved and the rest is history. But the fit onto a No4 butt, even at H&H was nowhere near perfect so it had to be fitted properly if the Armourers were so inclined - which most weren't! The only ones that were a perfect mechanical fit were those fitted by apprentices during their course