Thanks guys. No, didn't lube although the part I'm thinking is leaking was pre-assembled. Re thread sealant, I thought that wasn't required on AN fittings? Having a bit more of a look into it, yes I've definitely fluffed it by not removing the riser. Thread into the core is 7/16 which is what the supplied adaptor was. However that fitting doesn't want to start into the core (only trying by hand - a stripped oil feed thread in my core will make.my day worse not better). I'm going to play it safe and assume I've wrecked the adaptor thread by screwing it into the riser and grab a new adaptor. Still doesn't solve the location of the leak though. Maybe though if that adaptor to riser joint was leaking, under pressure it is running up the hose a bit and concealing where the actual leak is? I'll start with a.new 7/16 to AN -4 adaptor, install it properly and see where I am at.