Hi oldandlively, Thank you so much for this. I will try it, although there doesn't seem to be any vacuum at all even at the end of the first piece of hose, so it is possible the problem is the gun itself. By the way, I have been doing dry pumping as its inconvenient in my living and travel situation to do wet.
Another problem has just emerged. I was giving it another go and try and identify where the problem might be and in that process the handle has fallen off! I'm having trouble getting it back on again due to the small metal rod that holds it in place.... Tricky! Any advice on that front would be appreciated as well. Thanks alot!