I don't have to visit a library, Dick. I can access all the BSs etc on-line from my office. I'd recommend the system to you, but since Dick Puller Enterprises Ltd. can't afford a proper test pump, I think the licence fee would be probably be beyond your limited resources. The only reason we've had this stupid argument is that you incompetent bodgers think it is alright to bodge together something from old car tyres. Why would anyone do that if they had the proper test kit in the first place?