Hello Bushie,
Thanks Big ted and Grumpy for steering Bushie in the right direction regarding his tight rings. (terrible oversight by me)

Bushie, that thread above is referring to an internal magneto.

[Linked Image]

I have measured the coil above and got 6.1 kilo Ohms for the secondary coil and 1.24 Ohms for the primary coil.

Like Bigted, I use a card or visitors card like in the image and stick the magneto to the flywheel magnets, then torque the bolts down.

If you want to read some magneto patents, search magneto pdf's at freepatentsonline.
Some of these go into great depth.
Example:
http://www.freepatentsonline.com/4401096.pdf

Happy is he who penetrates the mystery of things.