Roper got their name by virtue of how they used a piece of rope as a seal in water pumps. The modern viton lip seals we take for granted are a recent thing. I'm old enough to have rebuilt a car engine where the only seals available were leather. That's why cars leaked so bad 40 -50 years ago. Chryslers used these strange "Ball and Trunion" universal joints that had a big leather bag around them to keep the grease in and the dirt out. So seeing a wooden bearing seal is not surprising. They didn't have the material science to make a modern oil seal. Old vacuum motors had shield bearings for the same reason.