Fun update, a picture of the horn switch naked...well, not the exact as the Mangusta, the picture here is from a ~1971 Rolls Royce Silver Shadow. The quality of the Lucas pieces is quite high (in comparison, the 'fits MGB' clone used a lot of glue and the end cap is metalized plastic).
The second picture is a comparison of an original Mangusta stalk (marked 34827 with 1967 date code, with broken knob), the Silver Shadow stalk and a non-Lucas replacement for the MGB. The Goose shaft is a thinner shaft covered in a rubber/PVC black cover. The stalk itself is splined and -pressed- into the switch body---so to extract (and only when the body is plastic, unlike the all-metal Rolls Royce item here) grab a big pair of dikes and slowly leverage it out.
The switch end on the Goose shaft is crimped over the 5mm tube, it is more integrated in the thicker Rolls version but it -is- that the rectangular/w oblong sides alignment (the white plastic) that keeps the knob from rotating and secures the motion as the button is pressed. The knob does -not- ride on the shaft.
So yeah, lets say you want to reproduce the 34827 (that has the bend near the base, ending up at about 10:00 on the steering wheel)--probably the trick is to get the 119SA made for the "Ford Transit MK1" (Lucas 35353) that comes with a very long stalk shaft (and an even longer knob, I think shared with Jag)-- replace with a knob from a Silver Shadow (nobody is saving these, used are common), pull each of the shafts out, rotate the "wash" imprinted text to the invisible side, and press back in. Count on about $100 each for these 2 pieces. Or, instead, just pay $800 plus shipping for a repro (!)
