John, thanks for those Cad drawings but the drawings I was after were definitely pen and paper type drawings which clearly showed the mechanics used to raise the rising bite.

Interestingly the side lock is a bar action type.

Strangely enough it seems extremely difficult to find even one picture of an actual lock plate as used by Rigby. Heaps of pictures of H&H, Purdey, Boss and Westley Richards.

Matt.