PS - here's what the TR2/3 Service Instruction Manual says "To fit control head and stator tube to the steering wheel" -
1. Place the steering wheel in the straight ahead position. This position can be checked by inspecting the alignment of all four wheels.
2. Feed the stator tube, with the anti-rattle springs in position, into the inner column of the steering unit with the tube slot uppermost and at the 12 o'clock position. Allow approximately 1 inch of tube to protrude from the end cover of the steering box.
3. Fit the brass olive to the protruding stator tube and secure with the gland nut. Loosen nut back one turn; this is retightened in a later operation.
4. Feed the wires from the short tube of the control head into and through the stator tube now in the steering unit. With the flasher control lever of the head at 12 o'clock ensure that the vertical lever of the stator tube plate is at the 6 o'clock position. Failure to observe this point will mean that the flashing indicators will not cancel correctly.
5. Secure the control head in the box of the steering wheel by tightening the three grub screws situated radially in the steering wheel hub. Do not move the steering wheel during this operation.
6. Tighten the gland nut to secure the stator tube to the steering box end cover and reconnect wires according to the colors or identification marks.
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Edit: manual later says "The control head on the adjustable steering unit is similar to the normal equipment with the exception of the stator tube. This consists of a short tube with indents at its lower end to form a key, and a longer tube with a slot at its upper end. The two tubes telescope together, the indents engaging with the slot provided. The purpose of this key and slot is twofold, firstly to prevent rotation with the steerig wheel and secondly to provide telescopic action as the steering wheel is adjusted on its splines.
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The procedure to fit control head is the same as fitting normal equipment, but it may be considered necessary to aply a smear of grease to the upper (slotted) end of the stator tube to ensure freedom of movement. It must be pointed out that over greasing at this point may lead to corrosion of the rubber insulation of the electrical harness and cause short circuiting. The electrical harness protruding from the stator tube must be free to allow a portion to be drawn into the tube when the steering wheel is adjusted to a higher position."