May one lock a door made from a single board (delet almana) that is entirely removed when opened?

ShabbatBuilding (Boneh)

Synopsis

The Mechaber prohibits locking a single-board door that is entirely lifted out when opened, even if it has a hinge, due to excessive resemblance to construction. The Rema permits multi-board doors and multiple-board locking arrangements even when lifted out, provided there is a lower threshold.

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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