Ha, your not on your own, I gave him a hw100 to service and rebuild as it had a leak, came back still leaking, I was told, oh I don't do the cylinder as they can be notoriously difficult, and I couldn't test it as you didn't include a filler probe with the gun, but happy to send you the seals if you want to have a go yourself, still waiting for the silencer that never came back with it.
Carl, we have spoken about this several times before, still nothing, your not a man of your word.