#4 I utilised an old secondary carb diaphragm to be a patch for the outlet. I was intending to use a bicycle internal tube patch package but I couldn't come across it. It truly turned out better than expected since the condition in the diaphragm conforms pretty well with the http://felixortuu.getblogs.net/24747428/the-5-second-trick-for-hepa-filter-vacuum-bag-boulder