TUC Thanks for that, I assume that 'normal' or good practice would require a new nut and bolt fitted as directed and then checked for free movement. hardly a difficult operation and seemingly in the general scheme of things not expensive for what it does. I can see that in place seat servicing would be a real loss of good practice, and also a loss of a good opportunity for a loose article check at the same time. Considering the location of the only operating handle being low down in a restrictive place that itself makes a cogent inspection difficult in situ. With that mind set running the show it beggars belief that no one saw a big red light and flagged up what was quite obviously a dangerous practice for such a complex piece of safety equipment. No wonder they b..... up the glider fleet.