Hi Gelbster,
thanks for the links. Sorry, at the moment i have no spare time to tinker with the bearing topic. So just read a little bit.
There are also sealed 6204 bearings that are proved under vacuum conditions. Because of the over - underpressure in the ims tube on different situations this might be an interesting option. Will do a research, but at the moment there's no time to do it.
Markus
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