Stephen,thanks for the info re the Lexan. If you can get the chart number I would be grateful but dont go to a lot of trouble. Peter Amos TaitTait #478 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.7.2 - Release Date: 21/01/05 1106727481.0