340-6 rear carb issue

so far so good. believe i was making a bigger deal of it than it really is. removed needle & seat & sprayed it up with wd40 wet it with a little vaseline & slipped it back in. played with float adj (have a question about that) & it runs well. lousy little spec of dirt. runs nice hot in drive foot on the brake. smoother than i can remember. My question- when reinstall needle & seat- remove float level plug & wiggle fender to drain bowl. how far in do you thread seat into carb before beginning adjustment.