I have 3 older take-off rotors, I am happy to send them off to anyone who is willing to pay the flat rate shipping, limit one rotor per requestor, I think I can get a rotor into a Small Flat Rate shipping box, the domestic shipping is $7.20, international is somewhere, I believe, in the mid $20s.
As Dyno Dave pointed out heat and mechanical intervention diminishes a permanent magnets effectiveness. I don't understand enough about the properties of rare earth to know how effective re-gaussing a magnet is, so I purchase new stator/rotor/reg-rec each time I rescue an old motorcycle and go on and worry about something else.
A side note: With a charging system more isn't necessarily better, balance is better. When you purchase a new charging system it is prudent to add up your watts and purchase a system that covers the electrical draw with a modest extra capacity. The energy that you don't use is converted to heat, your reg-rec is designed to handle the heat form a few extra unused watts, but its useful life diminishes with increase heat dissipation.
There are a number of members on this forum that have electrical backgrounds that I hope will chime in and give us a run down of what kind of draw the various appliances attached to the Norton require, to come up with a menu of suggestions as to what charging system output is appropriate for your Norton.