ive been having trouble with my hw100 leaking,,only guy around seems to be xtx air,,none of our local gunshops will touch the hw100,they all said its got to be sent away.but my mate gave me a number of custom engineering in aberbargoed,,met up with rob the owner,he regularly services most pcps on the market as well as springers.his knowledge on the hw100 was spot on...his number is 07790369926 if anyone needs anything done give him a ring.