Hallo out there. I have been given a 51 button Jeffries Duet Concertina which was formerly owned by my grandfather and has lain unplayed since his death 50 years ago. It has now been renovated and I am starting to try to play it. I can read music and play piano to a poor intermediate standard, but have no knowledge or experience of concertinas. I seem to be on a sharp learning curve. Any advice on obtaining a tutorial book would be appreciated. I am told that my grandfather was taught to play by one of the Jeffries brothers whom he met in a pub in Stonebridge, Willesden, London. In the concertina box was a handwritten button diagram for the left and right hands (probably written by Mr Jeffries), so I know which button to push for which note. I do not know anything about push and pull or air control. If there is anyone out there, HELP ! (Please).