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Thanks to all of you who responded to my query. The replies I got suggest that Plescon magnetic systems do have a blind spot. I'm not sure whether the same applies to 3M and other systems. Andrew Madden Dr A.D. Madden JFS Learning Resources Centre 175 Camden Rd London, NW1 9HD 020 7485 9416 ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%