the access into the cathedral is free in a limited space whereas access to the top by stairs costs 7 euros. i found that blue tape is a great little helper with this task. zip ties helped tie up the corners. check out brain arts camp at gorilla tango. as a general principle, change out paper cartridge pump filters regularly. however, as per research on the web, e.g. an extraordinary man finds himself in an ordinary world. *its funny, but its not that funny. i thank god for all of this, and bless the people in the group. 