You can carefully drill 2 holes in the seal and insert 2 sheet metal screws. Use
them to pull the seal.

Make sure the reservoir is full.... place a largepan under the steering
box.... start the motor and crank the steering wheel all the way in one
direction.... if that doesn't blow the seal out, turn the wheel all the way
in the other direction.....

I do not like to use sharp objects on the sealing surface of the sector
shaft for fear of damaging the surface. I've been doing it this way for many
years...