Reading a Raffan book and there are photos of his vacuum chuck that is connected to his shop vaccum rather than a pump. There is a vacuum cleaner hose hanging from a short section of pvc pipe between the headstock and the work.
Does anyone have construction details for this kind of chuck (high volume rather than high vac pressure)? Somewhere I read that this (high volume system) would be good for leaky wood that a pump could not hold.