After 6 months and several installs, I suddenly couldn't tighten the harness straps enough after the latest install for my Radian R120. I'd never had this problem, so I knew something was wrong. Before I posted asking for help, I tried re-installing it and figured out the problem! In case anyone is having a lot of problems with this, check it out! I looked where the latch strap goes through the car seat (rear facing) and discovered this-
It should look like this (but not twisted)-
That's the base of the harness strap wrapped around the latch strap, and it's what was keeping mine from tightening. When dd was not in the seat, I would tighten it but it was still not easy. I wonder if a lot of other people are having this problem. Hope it helps someone!
Edited by myfairbabies - 3/5/13 at 1:00pm