I have recently started back on a long neglected project: my slidinig glass doors. They are working fairly well, but the bigger problem is the sliding screen doors which are outside of the sliding glass doors. The screen doors are just about impossible to move at all. Yesterday, I got into the project, and found that there are roller wheels on the top of the screen doors, and there is a space in the upper door frame to remove them. I cannot determine if there are any roller wheels on the bottom, tho. There is not enough room to push the screen doors up, off of the bottom track, and lift them out. Right now, it looks like the only way to get the doors out to examine them and see just what they need to work properly, seems to be to take the screen door frames apart. Anybody got any ideas on how to deal with this situation?