Hi I've just had one of these lanterns given too me as a thankyou for a favour I did for a mate.ive filled it with fuel and replaced the mantles but can't seem too get it too light properly.its working but rather pathetically.ive followed the the instructions on the side which say too turn the pump thingy too the left cover the hole and pump 30 times but in doing so I can't even get the thing too even push in once unless I take my thumb off the hole which it will then move freely.hope that makes sense.can anyone steer me in the right direction