I want to make a bottle wall outside.

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the wall will be in sections of 10foot high x 5foot wide. I need ideas on what I can use as spacers. If a bottle breaks for some reason I do not want others to slide down and hit the next bottle. I know that rubber washer will not work, they dry out; swimming noodles are hard to work with. I need to be able to disassemble as needed for replacement reasons I am using 1/2 inch conduit as my poles. Here is what my friend Mary did.
q i want to make a bottle wall outside
Mary's yard
  10 answers