Any Casino techs know:maygay aqua action casino 2004

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I dont have a manual,machine is set at max 45p for max 9 lines, wins are £1=100 credits. possible jp 20,000 credits,seems abit small to me.Anyone know how to change the stakes to say 90p for 9 lines,so instead of 1p a credit it would be 2p..p.s guy i bought it off says he tried changing it but machine refused, wether he didnt do it right i dont know>thanks to anyone who can help