go to these guys their explanation The rocker has seen a major modification with the replacement of the rockers themselves. A tendency for the chair to tip too far forward has been corrected and there is more ‘rock’ to the chair. It also enables the sitter to find a comfortable position when sitting still.
While I was about it I rubbed down the whole piece and gave it three more coats of oil making the finish much richer with a deeper lustre. The chair continues to elicit complements.
I sit in the chair for my lunch time sandwiches and often this will become a nap as I am so comfortable!