Thank you for your answer, but I have already done what you suggested, it is as if the disc has fused on to the grinder, I went on another site and several people have had problems with powercraft drills where the bit has fused on to the drill so they can only use the one bit that is stuck to the drill, but thanks again I will have another try, or maybe have three shredded wheat to give me more strength.Harry.
Harry Nuttall, August 2011