I think these are just different terminology for the same thing. You take the saddle from the library for a week or whatever -- it's not just sitting on it onc

I think these are just different terminology for the same thing. You take the saddle from the library for a week or whatever -- it's not just sitting on it once in a shop. E.g. https://www.freerangecycles.com/faq-1#:~:text=small%20(but%20growing)-,saddle%20library,-!%20Folks%20can%20put https://www.freerangecycles.com/faq-1#:~:text=small%20(but%2...