By public request, a minor treatise on diopter rearsights - particularly contrasting the design of a W+F K-diopter for a Schmidt-Rubin K31 with a Parker-Hale 5C for a Lee-Enfield No.4 and a modern RPA Trakker.

Also featuring an awfully chintzy table cloth that doesn't belong to the Bloke, but he wishes it did :)