Hey Mick,
Good work getting the spring on! - I slightly damaged my new paint job wrestling that sucker onto mine - patience is a hard lesson for me to learn, I wish I'd asked for tips first!
The paint around your neck is definately a little too high! That is about where mine was at when I got it back from being resprayed - I couldn't believe it when a week later the paint bubbled out all around the filler!
I trimmed the bubbled area off and it turned out looking alright when the cap's closed, but again if only I'd asked for tips first....
I think Calj will agree with me-
You need an actual definate gap between the paint and the caps rubber seal (when it's fully compressed closed)
John