#1 What did you eventually do to make your hole in the concrete ? I have a 23 cm thick wall and want to make a 70 by 70 cm square ho= le #2 How did water-proof ( uncured ? ) glue come to be floating on the surfa= ce of water in swimming pool ? Gus --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .