Nicely displayed, Mal. That Magister coil looks like something the PMG would have supplied in the 1940s, or a WW2 era earphone.
1. Is that just a turnbuckle function on the height adjuster? If it could be kept lubricated, say by having O ring seals at both ends of the turnbuckle, it might last for generations.
2. Can you give us a circuit diagram for the ignition system, and/or pictures of the magneto?