Sliding glass door - unknown brand

Hi, just bought this place and found the sliding door misadjusted and I am unable to readjust the rollers. Found the friction lock device to adjust the door height is bad on both door rollers with the internal nut stripped on one roller and the adjusting screw is marred beyond use on the other roller. The entire device material is stainless steel including the rollers.
There is a partial faded sticker that indicates the manufacture is or the supplier is from Georgia.