The answer to removing the steering column control C4514 (this is the long tube clamped at the steering box that the stator tube from the manette slides in to) :-
If the rear window is in place and removing it is not desired, it is only possible to remove the lower tube by moving the steering column.
If the car can be lifted high enough then just altering the angle of the steering column allows the new tube to be inserted through the nearside under bumper air vent (picture)
. Otherwise the whole steering column needs to be removed from the car.
It’s a lot of work but it’s in the Service Manual.
Extra points of note:
Remove manette, wiring, steering wheel and associated parts on the column.
Check no wires have been damaged in the bulkhead whilst removing the steering column.
To remove the fascia board assembly it is necessary to remove both front screen pillar cappings and the instrument board assembly. Protect the bottom of the front wing paintwork as it’s a tight fit to get the steering column out.
Check the new stator tube is perfectly straight.
Loosen the bottom clamp and using a mandrel of fractionally smaller diameter
knock the old stator tube out from the top or bottom. Preferably don’t use the new stator tube to do this as it could get damaged.
Extracting through the top end it may be necessary to saw it up as it comes out, depending on where the fracture is.
Burr the top end of the new stator tube to make it easier for the manette tube to slide in to place and check that it does before assembly.
At all times remove any metal filings and rough edges.
Smear sealant of choice around lowest 2cm of new tube before drawing it (from top or bottom) in to place.
As elsewhere posted, ensure the slit is in the vertical position before clamping or else the manette will not be upright.
To ease replacing the steering column, remove the bracket fixing the instrument board assembly adjacent to the steering column and if it is not an act of heresy, open up (file away some metalwork) on the steering column hole on the bulkhead assembly (picture).
The points mentioned here are not a complete description but supplementary to carefully following the Service Manual directions for these procedures.