Fujimo, some good testing would be a plus, I know you are putting in a lot of time and effort into this and don't want to end up with a warehouse full of unsold product. I only did a simple hang a weight off the end test. A real scientific test would be more involved, too bad I don't know any engineering students at the University of Florida..they could really test the materials and give real results. I had to buy the glass, so I did lose a few dollars. I should glue it all together and make a solid fiberglass riser.