thanks sandlion .. it is very helpful to have the benefit of your views. Sue uses her limited drilling knowlegde to try to bamboozle and scare people .. its an ego thing, one of several of her psycho issues, so it is always good when a person with drilling experience can counteract or at least give a balanced answer to her never ending tirade. wouldnt it be wonderul if we could get sue to sniff some of that GDN gas !! thank you again.