I just finished a glider chair (my first) for a friend of mine. It looks good and sits fine, until you start to "glide" in it. Then it has a catch in the motion that makes "gliding" in it uncomfortable. I used this set of hardware,

http://www.rockler.com/glider-bracket-hardware

According to the instructions, which were minimal, the arms hang straight down and have a 7 1/2" distance between centers. That distance will be determined by mounting them, as the lag screws can only go at a certain distance, once the top is mounted. Or so it seems.

Any idea(s) whats putting the "hitch in the get-along?"