Felt seals: Again you can take a look on my blog on Wordpress page
Drivning 2012/13/14 (Drivetrain 2012/13/14). Just scroll down a little, and you'll find Figure 80 from the Repair Manual 1918-1924. (The text is in swedish language.) Note that the figure shows 1922-1924 models, but I think that the drive axle end, the hub and the brakes are identical on earlier models.
I found nowhere to buy the felt seals so I had a shop to make them. I had no measures, so I had the outer seals made too thick. So I made seals myself, from more soft felt, and so far I have not noticed any leakage. The inner seals were also a little too big, so I had to press the quite hard. Maybe that is why I so far has noticed no leakage...
Pictures of the brakes before putting the drum on: How about
these? After you open the pictures I guess you'll have to wait a couple of seconds before they ar downloaded with full resolution.