pvc and bottlecaps.i could't find thinwall pvc where i live(caribean)so i used the thicker pvc made them 2" heated them over my stove without realy burning the plastic but just heating it just enough so it get's soft and just jammed the bottlecaps into the pvc and molded it in form .after that just pop the cap out use some glue and then glue the cap to the 2"premolded pvc.it worked perfect for me,greetings
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