Well, they were quick with their answer… but not what you would like to hear! They could not even find the bearing in the 1940-s catalogues…
I’m sorry!
Erik
PS: a lot of bikes used the burman boxes (in fact my 1927 Ready has one too, see pic). Maybe one of the spares schemes of other make clubs?
PS2: Ich dachte, ich suche auch mal auf dem Forum von motoclub.de aber das hast Du selber auch schon gemacht… 
