does anybody remember…there was kind of technical drawings of stopping valve’s mechanical construction …where to find it 
Heres a couple of drawings.
RORY
The drawings Rory has posted are from Chris Bayley’s website http://www.bagpipeworld.co.uk although I cannot find them on it. They may have been lost in the recent rebuild of the site by Martin Palmer-Smith (SWPC).
John
And there’s the simple way out here: http://www.uilleannobsession.com/docs/patrick_hutchinson_valve.pdf