Terry and Mike,
                 Many thanks, problem solved. Seems very sensible so I'll 
away and dangle the spoke in its position. See all this modern technology, 
fair smartens you up a bit.
Ian.

Dr. Ian Montgomery,
Microscopy Service Unit,
Graham Kerr Building,
Institute of Biological & Life Sciences,
University of Glasgow,
Glasgow,
G12 8QQ.
Tel: 0141 332 8855 Extn.6644.
e-mail: ian.montgomery@bio.gla.ac.uk