Hello Robin Stevens. I tried to look at the photos you posted but it seems I am barred from the pipermail site.... So I'll have to hazzard a guess that you are talking about that strange "pull-through-like-a-bicycle-brake-" method of tuning. You need a tube-spanner for this job. The only trouble I had with it was replacing broken strings - it requires some fine guess-work. Am I right in my guess? You also need a spanner to turn the tube-spanner. This gets close to the 'cello and violin adjusters, non? Regards Michael G (UK)
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