Never had problems tightening but always tugging on belts to tighten them,it's always hard doing belts up by yourself they never seem to be in the right place. i've had problems loosening belts driving other people's cars, one time had two people help me they were tight. I had a routine, lap belt was close to where it would be attach the crotch strap shoulder strap pull lap belt then crotch strap then shoulder harness as tight as possible. i've seen people get hurt because the belts were loose!