Many thanks to everyone for their interesting comments.
I think I will take abellringer's advice and start a new thread about lubrication. It seems to be an area of interest to many and there is no general agreement as to the best approach. Perhaps I should start it here, under 'collectables', but it might be of interest to those on the general site too.
Garvin, your own advice - as usual - is first class, as was the link. I fear, however, I would have to see the tuning operation with my eyes in order to appreciate it and fully understand it. The written exercise, in the absence of viewing, is too complex for someone without a mechanical mind and no prior experience.
Rgds to all
A