I have 'found' a pair of Angram beer engines with glass cylinders, they don't appear to have any suction. Anything obvious that I should be looking out for when I dismantle them? One of them has a slightly broken plastic part where the beer out line connect to the cylinder to go to the swan necc, looks like a fairly basic threaded part, again any clues here? If I can't resurrect them at least I have some nice ceramic handles........