Back in the late 70s I used to be a safety diver for the powerboat races organised by the Royal Motor Yacht Club (RMYC) at Sandbanks near Poole, Dorset. The main boat shed was a seaplane hangar during the war and the back wall was covered in various outlines of rigging fixtures & large spanners for Kingfishers & Sea Otters. If you haven't seen it, the book, "Wings over Dorset" (ISBN 0948699 10 8) has a history of the larger four-engined operations from Poole Harbour but nothing about the smaller planes.