We've got an old Petit Godin wood burning stove that we installed when we bought the house 22 years ago. The existing flue that comes out of the back of the stove and then turns 90° and goes a metre up into the brick chimney is in a bad state now so I bought a smart new enamelled yesterday. The original was 125mm dia but the nearest I could get to replace it is 130mm which is just too loose at the stove joint to give a good seal. So I also bought a 125 > 130 adapter. Unfortunately the only way I can make this work is, instead of having male > female joints, to have female > male joints. Do I risk having smoke leaking out from the inverted joints? I've bought a fire proof mastic to glue everything together - would this be enough to seal the joint sufficiently? Can anyone suggest any other solutions before I start... Thanks.