That should have been:
"The rear tire on my 1949 B wobbles. On inspection the rim center is loose on the axle (it has the rim with the 1 large nut holding it on).
The nut appears to have been rounded somewhat and also only has two flat sides. A 24" farm wrench won't budge it either direction (haven't tried the "pipe extension" because I don't think I can hold the wrench on the nut)."
Sorry bout all the mis-typing - it's already been one of those days ...!