Hi Bigted and sorry for the slow reply. I got back to this one tonight after fixing a few others I had on a agenda.
I measured the float clearance with the correct drill bit and re-set it as close to the 4.36mm level that I possibly could. The float has no leaks.
The new seat has the rings face down as they should be. Well I am happy to be corrected if thats not the case.
Tonight I put it back together carefully and no fuel was leaking so fingers crossed its all good.
I also re-checked for anything to cover the light knocking/rattling and I nothing stands out.
Worst case this one is a learning experience as I am not comfortable moving a mower on that I'm not 100% comfortable with..... I havent crossed this one off the list yet.
Would appreciate your thoughts as always
