Please, do you know of anyone who specialises in non 'standard' long bobbins? My Seidel & Naumann bobbin is 1 & 4/5in long from tip to tip, and the little brass ends are slightly domed, and 7mm across. I think I am not going to have much luck finding any extras, somehow. The tyres I got for the bobbin winder were far too small, but I cut one in half, and a section from another, and superglued the cut ends together. Voila! Necessity is the mother of invention, they say.