Patio door project

I am having a terrible time with my rollers on this door(hence the broken handle) and was looking for rollers and advice on repairing those also.
I know that you will eventually need a picture of the rollers once I remove them. There does not seem to be an adjustment screw for these rollers. The small hole above the screw seems to lead to nowhere. Am I wrong about that? Will it be very difficult to remove the door if I am not able to adjust a screw to lower the door as shown in you video? I have also read your article in "The Natural Handyman" by Paul Pallas and that has been helpful also and has inspired me to take on this very necessary project.
Any and all advice would be very welcome and appreciated!

I just thought you may need some additional information in regards to the handle replacement I just inquired about.
The plate that is mounted to the door is 7 1/2" inches long. The mounting screws are 2" from the center hole/locking mechanism. The actual handle that you grasp is 9 3/4' long. I am looking for something that will work not to concerned about appearance/matching look of the original. Hope this helps.