Marathon harness adjustment?

[wendibird22]

Anyone else have a problem getting the Marathon harness snug enough? DD is RF at 19lbs and 29". I have the harness in the lowest slots. When I pull the harness adjuster strap it gets almost snug enough but then stops and I can't pull it any tighter and it feels as if the strap is lifting the adjuster button/lever as if you were to press it to loosen the straps. Because of the big black plastic "cover" that goes over the harness straps on the back of the seat I can't tell if the harness yolk is reaching the bottom of the seat...harness is really tightened as far as it can?

[Joolsplus2]

You can take that black belt guard off (it's to keep the seatbelt from tangling in the harness when it's installed with the seatbelt forward facing, it really doesn't have a safety function) and see if it was getting snagged on it...?

[KrisM]

It might get tighter if you do a pull-release-pull-release type of tightening, rather than just pulling it tight in one shot.