Dave Sr. from SWISCO responded:
May 5, 2015
We have no videos on how to replace the 23-075, but I can still help. First, lay your door flat on a table or pair of saw horses. Then, unscrew the frame screws and use a hammer and a block of wood to tap the bottom rail off. The roller should come out along with the rail when you remove it. You then just slide the old roller off the rail and slide the new roller on. Line up the roller to the bottom rail and lightly tap on the side to the mirror with a rubber mallet, screw on the frame screw and install the door back on track. After that, all you have to do is adjust the roller.
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