Today i took delivery of my new butterfly 828/350cp lantern.bought on fleabay, i have a large collection of tilleys and a few colemans,. i was pleasently suprised upon lighting up butterfly it popped first time and gives out a very strong white light its been lit a few hours now and the light is blinding i have to turn it down,gaves out a nice hiss which is sharper than than the tilley hiss but less noisey than the colemans,. my query is the pressure gauge is not marking,had to be a fault for only 50 euros paid! the lamp came with a reflector and a stack of spares. can anyone please advise me how to check for certain that the gauge is faulty.the lantern is brass i tested it.