Tanks won't screw all the way into my mod

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Hello,

I have an Innokin Coolfire TC 100 and I've noticed that my tanks are not screwing down all the way into the mod which isn't an issue I've encountered in the past. There is probably about 1 cm of space in between the connection where the tank used to sit flush. The mod is firing fine and the tanks are working so I suppose it's more of an aesthetic issue. Any tips?

Thanks!!

Tanks won't screw all the way into my mod