ITM made a universal seat post in the 70's/80's. It was alloy and quite slender. It worked by having various size plastic sleeves that you left permanently inserted in your frame's seat tube. The alloy never got scratched on the pin and it was very easy to swop your favourite saddle from bike to bike.
I've run out of sleeves, and need some in 26.4, 27.0 and 27.2. I've tried to find some, without any luck. Can anyone on the list help, please?
Neil Foddering
Weymouth, Dorset, England