I'm enjoying my "new" 1955 300 U, lots more power than my ferd 8n. The 300U leaks coolant out the water pump shaft and/or housing, it's hard to see up in there without taking it all apart. I don't see anything from Steiner or the other parts houses, seems like the 350 and later models (and the M's from the previous generation) have plenty of support but not much out there for the 300 U. Any suggestions as to what I should use to re-pack the water pump shaft with? Or sources for a rebuilt pump?