Got one and lost the Delrin insulating washer on the first night!
Anyway, a couple comments... You are supposed to lock the aluminum adapter to the bottom of your atomizer. If you have a KF/KFL/Russian, it will block the fill hole, which makes filling a little more painful. Works great with the Fogger v2 since it fills from the top.
Also, the Delrin insulating washer may fall out as you take your atomizer off. So if you are at a party and showing off the
mod to someone, make sure it's still there when you put it back together! Heh
I'm still using it without the washer. I have a vapesafe fuse just in case.