I thought we could save the oil seals for the half shafts, but they were a bit past it, so Steve made up some new ones.
He first turned up a tapered plug of 1 7/8" diameter from an odd piece of timber. Then cut a leather disc with a 1 1/2" hole in the middle and soaked it in water overnight. He carefully pushed it over the plug, stretching it as he went and working it to shape. After 24 hours, it was dry enough to be removed when he punched out the bolt holes with a wad punch. No problem at all in the end.