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My Clarke cabinet had a strange suction pipe. It was a metal tube crimped inside a larger tube that didn’t seem to serve any purpose. The hole was only connected to the inner tube that was about 50mm longer. I read some time ago that the suction tube needs an air bleed to work well. What I did was to fit a new larger suction hose that fitted over the outer tube as well. I then drilled two small air holes into the top of the outer tube. I also cut the suction end of both tubes at 45° as suggested by another manufacturer. Media feed is very much better now.