Marcus ,
I have just disassembled a Ignition/headlight switch from a 400 (same as 401 but uses a different key blank) .
As you can see from the photos , the grub screws that hold the wires to the rear of the switch .
The internal contacts shown are for the light switch which had a build up if dirt/dust and some oil and would not have allowed a proper contact .
To remove the key barrel assembly and expose ignition switch contacts the central lock nut would have to have its solder removed .
Unless the ignition switch was not working I would not touch that .
I hope this helps
Geoff
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