Hi had this happen to my old novak ss8500 motor tryed a few glue's with not much success .gave up in the end and contacted Novak, They were great told me to send the old one back, they sent me a new one.
great service the motor was 3 years old.
any way i have scince used a glue called JB Auto weld, Its a American product that i would assume halfords would sell.
if you get no joy from the manufacture slide the rotor down the shaft.
grind a small flat on both sides of the shaft that the rotor covers and apply some of this JB auto weld in the flats slide the rotor back over the flats and wait for the glue to set.
good luck this is the only glue i would recomend due to its ability to withstand heat etc.
Hope this helps,
Steve
