We bought 2 of these. Installation was easier once we found the instructions in the side pocket of the chair after reading the reviews.  We ran into 2 other problems... The metal on one of the tracks was bent and we had to bend it back in order to be able to attach the side panel/arm. Also,  both springs were off of one of the chairs when we opened the box and they were very difficult to get back on.  Otherwise they are good chairs.