The chap from Carlisle who used to own the one at the Yorkshire museum was Niel Moffat. I have lost his email address but I'm sure someone on glider pilot. net would know him, he was a bit of a demon on those ridges in the lake district. As I say a nice bloke and I feel sure he would be able to locate said tool.
I must confess to not actually liking aeroplanes but this one raises even my curiosity, would love a ride in one.
bb