Meaning black nut needs to be done up more? I'm not sure that is possible.
You will always have a gap when the rims starts to curve, this is not where the air seal is made. IF you have a leak, then the valve needs to be tighter pressed into the rim, so that the sealant creates a seal that doesn't move.
Ok, thanks, I'll investigate further
@Glws started
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Meaning black nut needs to be done up more? I'm not sure that is possible.