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Thank you all for your comments they are very much appreciated.It does not look like I am going to get any peace until I tell you how I do this I have not said because I consider it to be very very riskyI use a mini grinder with a 3" chainsaw disc I wear a steel butchers glove on both hands and wrists and welding gloves over them.It is all done free hand.I do not recommend doing this as it could possibly be dangerousRegards George