http://blog.makezine.com/archive/2009/05/homemade_bells_from_old_gas_bottles.html

Here is a link that might be useful: sites might help

I was going to suggest looking at my website, for photos of Bill cutting ours, but I have recently had some things done at Cox cable and My website has disappeared!!!! Will have to check into that today...I sure hope it's not gone for good. Anyway, we emptied the bottles, filled them up twice with water, letting them set in between. You may have read on 'sites that might help' that it was one of the last things he did for me before he died. I still haven't hung them.