G'day .Look I know there's probarly a simple answer to this problem but I'm Buggered if I can work it out ! I have a Lee 20lbs Bottom pour Furnace ! It has a nasty habit of not sealing from the spout on the Bottom after you've been casting for a while it just dose'nt seem to close off properly .So I've got to the point of just useing a ladle to cast with & this seems to defear the whole concept of the bottom pour ! Any ideas please?