MGB steering rack

[mgbob@juno.com (ROBERT G. HOWARD)]

  I would like to be certain that there is enough oil in the steering
rack. This is a "later" car on which no filler nipple is fitted.  My
first thought was to take off the shim cover and pour it in. It won't go
in, of course, as the yoke (piston shape) is in the way.
  Question--how does one remove this yoke with the rack or radiator in
the car?
Thanks in advance,
Bob
reeking of spilled hypoid 90