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i could only find a substitute in oil filled bronze, would this be ok mated with a chromed steel shaft/support?
In principle, oil filled bronze is a good bearing material for a chromed steel shaft. I would caution that there are no proper dimensions on the one you found, and that sometimes they are sold by nominal size with stock to clean up to finished fit, so a "25mm" bore might be 24 and a bit mm as sold.
Paging @gbj_tester ...
My swivelling armchairs started to wobble, Cassina and their local dealer have been ignoring my requests.
Does this kind of (splined?) flanged Thermoplast bushing have a more specific/correct name to search by?
In the given dimensions i could only find a substitute in oil filled bronze, would this be ok mated with a chromed steel shaft/support?
It's the upper one that needs replacing as it has compressed/worn out, the lower one seems fine.