It sounds that way .
I must really have a look at this in the fleash.
Gordon just a thought... Could a seat upholster not sort it and recover a seat (sculpt / add something to make the gap less obvious?
I also wondered about this gap .
Don't panic my bikes not perfect and I'm fitting bits that are not 100% perfect but hey that's my call .
The main thing is you can now ride it safely and it works!
I'm sure a small gap will not prevent that so please don't feel bad
this subject interests me I thought about this injected metal tank or kept looking at ie tanks by accident so I am curious.