I also think you could use 2.0 mm metric stainless steel bolts (they call them machine screws), with the heads cut off and matching nuts instead of tubes. They have them at Clerkenwell Screws.
I tried google but couldnt find them on line so will phone tomorrow and get a few to play with. Thanks again and also for the tip on centering though that will probably fox me too!
Thanks
Helen
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