DS2 (5) is currently in a high backed booster sear with an integral 5-point harness. The seat does eventually convert to one where you just use the adult belt but I'm still unhappy about the position of the belt even when it's gone through the adjusters on the side of the seat. He also occasionally uses one of those cheap "hard cushion" type booster seats that the child just sits on.
I'd like to get an additional adjuster to make the adult belt safer - any recommendations? The hard cushion seat has a picture of one which fastens round the socket end of the seat belt with a strap that goes behind the child and clips onto the seatbelt to pull it down below their neck. (which makes no sense whatsoever if you've not seen the picture!).
TIA!