scratching

Hi guys I got a Smok r80 tc with a micro tfv4 tank 2 weeks ago as a kit. I've been noticing that the connections of both are scratched which I assume is from having to unscrew the tank each time I charge it. How do I prevent this? Will it eventually lead to both not connecting properly? I...

I hope some of you can give me a tip with this one. I have the IPV D2 with a Kanger Subtank Mini, what I have noticed is that the tank is scratching the mod at the 510 connection. Now I know this is common or atleast I have seen it happen on a lot of mods, is there a solution? I thought of using...