Thanks Alfons. I've read the Dr Bean has to be soldered in and my soldering is abysmal??. I suppose the only way to know is to pull it apart eh??. Is there any other non original but identical pump I can carry around as a spare. It's pretty grubby eh. The previous con artist...I mean owner was good at keeping the outside clean.This is the first time I've removed anything from it as I was going to do a full strip and check when I retired. Ha, looks like I'll have to do it sooner as retirement has gone out the window for the moment.