[TR] TR3 steering box

[Mike Denman]

Hi group,
    A question if I may... perhaps a stupid question... I have a TR3 with a 
split steering column which is non-adjustable. The steering box has a filler 
plug in the top of the box. The steering column also has a steering box 
filler right below the area where the column splits. The question is why two 
filler spots? Is it because the filler plug on the top of the steering box 
is hard to reach with the front apron on the car? If that is the reason then 
how do you know when the box is full of oil if you use the upper filler 
(where the column splits)? If you were to fill the box and the column up to 
the bottom of the upper filler plug the box would be "overfilled" and 
seemingly the extra oil in the column would put pressure on all the seals in 
the box. Am I missing something in my understanding? Does the upper filler 
serve some other purpose? Does anyone know the answer?
Thanks for your help...
Mike Denman