Paul from SWISCO responded:
June 24, 2014
The track kits we sell (such as the 23-500 for example) are made for 1-3/8" thick doors. I normally use the standard Luan doors, which you could purchase at a lumber yard or home center. I would think you could use a 3/4" thick door, I've never tried it so I'm not sure. I know the 23-200 bottom floor guide which comes with the above mentioned kit can be adjusted for a 3/4" door.
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