The famous Charles got me interested in his video on hvlp sprayers a great and intelligent broadcast this guys is one of the very best. Anyway he described one of the pumps as being just like a unit inside a vacuum cleaner. It got my old inquisitive mind going I currently have recently bought n Apollo 700 unit. I stripped it apart taken off every piece as it was filthy rubbed it down for re-spraying. There is nothing in it which would stump anyone. So Charles got me thinking could I experiment to make my own.I currently have an air pump new from a bouncy castle I see know reason to set this up with some intelligent additions including a way of simply reducing the air production a simple valve if you will once that is set up I will get started. If Charles reads this post, I am sure he would probably agree that for the very high price asked and paid, it is what we call money for old rope according to what you only see when you look inside or take one apart. I will keep you informed but Mr Neil is one nice guy he gave me helpful advice all those years ago when I started out and was just finished building my shop God bless all here you are simply the best. Alistair