I don't know if it is common or not but the sticks on my lx665 move stiff enough and have hard plastic covers with a ridge on top. this made my hands begin to get sore in short order so a year ago i took tennis balls drilled with a hole saw and pushed them on top. No more sore hands and they do not move around like you would think. been a year now and still are good. it is just used around home though.
