Where exactly are the gear stops that were added to the 14-13s and how are they adjusted. All I can find on mine are machine circular steel collars about 1/2 in. thick directly behind the self locking nut on the threaded shaft that runs the gear. Right side makes light contact with the bracket that hold the "nut" that runs the gear but the left side hits nothing. Also there is a very slight air gap between the stop blocks when the gear is fully down. Is that normal? Thanks, Rich