Here an example of an encapsulated track application, cover closed.  The tracks are built into the pool walls ahead of time, so no cantilever is needed.  Copyright Ellis Pool Covers, 2003.

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Ellis Pool Covers Inc. ◦  Sales, service, and local distributor of automatic swimming pool covers in Southeastern New England, (Massachusetts) USA ◦  14 Roberts Road Plymouth MA USA, 02360 ◦  (508) 746 1701 ◦  Fax (508) 746 1702