My bought in the Uk Vamo does look as though the 510 connector is crooked but you only notice it with an ego-style clearo, they lean a little. Mine is described as chrome but seems to be SS (no objection if it is). The only real problem is the spring getting warm. I measured the resistance and it's higher than any atty coil. So I'm waiting for a spring but think that they'll probably be hot springs. I was told that a thin magnetic extender would fix it though, used to have lots but now I'm wondering about butchering a fridge magnet. Oh well, can't expect perfect at that price and I can't afford a £100 anything. My Vamo sometimes cuts out with no warning but it doesn't happen often. I think that a flat top 186500 may not work though, depending on the real size of the battery.