The fatdaddyvapes connector is the best - is beefy and stainless steel with a brass nut to solder to, but needs to be shortened which can be a pita as you need to shorten 3 parts - the outer casing, the delrin insulator and the center post. The outer casing isn't so bad, but you have to shorten the delrin insulator and center post so they match what you did with the outer casing.
It needs to be shortened? Is it really that tight inside the case?
Fat daddy shipped me a set of 3, so I wonder how it would look/function using an extra brass washer on the outside as well as the inside of the case. That would shorten the inside portion of the connector.
attys aren't going to sit flush on this anyway, so what's an extra couple mms between friends?
If not, use a dremmel saw to cut the pieces?