Yes I actually got my new head for free too. They made a design change because they were breaking easily. I found a local carefree dealer who ordered the part for me and allowed me to change it myself - saving the labor charge. I just had to give him back the old part so he could return it.
I wondered where you said you were pushing in the pin if you meant one or both. They are a bugger to push in for sure.
Ask here before bringing it in for servicing. We may have run into the same problem and it could be an easy fix before you go spending your hard earned money on labor and such.
Good luck!
