The top of some filters are torn during insulation, the plastic is very thin and the overall height of the filter changes when I tighten the filter they break. So far this has been done with two filters and now I'm bringing them up to select the shortest ones. I'm not sure if this is due to improper assembly, a crooked top or bottom, or improperly cut cone material. They really last a long time and if they didn't break they would be very valuable.
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