Angle grinder (Rochester ME1)

Mini angle grinder, 115mm, 240V. Performance Pro. Good motor. Standard M14 thread but no back nut for the spindle, so its ok for sanding discs, wire wheels, mops etc, but I havent used it with a cutting disc because it hasnt got a back nut. Ive looked online, and cant find spares for this, the standard spares ebay etc. are a different size.