So im new to vaping and am considering purchasing my first mod. My friend that got me into it ordered a turtleship v2 hcigar clone on ebay but was highly disappointed with the quality. When comparing it to his Caravella he noticed that the battery had up and down as well as side to side wiggle room which seemingly lessened the quality of the mod. He seemed to think it had something to do with the adjustable (delrin?) piece at the bottom (sorry noob here). The mods I was considering were the turtleship v2, nemesis, or stingray which I am pretty sure all have this piece. He mentioned something about a nipple top battery rather than a flat top that may help this but I just want to make the right decision the first time on my mod and not have to return it. Is there anything that I need to know because I am now very skeptical of buying any mod with this delrin piece? Any advice is appreciated. Thanks in advance!