Iron on the rotor

It is a temporary magnet 'keeper'. To be removed and discarded.

Yes they just hold the magnetism during storage. Discard them when the rotar fitted. 

I always keep those rotor clamps for use on my used rotors, as they are good for what  Dave has explained.

G'day Lubos

In the last photo you appear to have the stater and the rotor and the keeper all assembled. This means you have the wrong rotor. They came in two diameters, large and small. The stater to rotor clearance should only be about 10-15 thou.

Bill

Sorry Lubos...but it won't charge. My bike came with the same undersize rotor, and it would not charge. But I think the small ones are no longer made, so it might be saleable. Possibly to a Norton Lightweight owner.

Stators are £54 +vat and rotors £63 +vat  from RGM Norton. They will be the larger size. If you have a three wire stator, it looks like you will have to buy a rotor to fit. I don't believe you will find the smaller stator unless in a jumble or Ebay, etc...buyer beware!