My Naudet recording barograph also stopped working. I have sent it to Robert E. White instruments in the USA for repair. They are experts, and can fix most any brand of barograph. Unfortunately, the movement of my barograph had stopped working, and they are awaiting Naudet in France to send a new one, but I expect to have it back on the boat soon. My barograph is about $1000.00 new, and it was worth the trouble to have it repaired. I have had great service so far, and I would recommend sending it there. I'll give you a link to them at the bottom.