Sheet dispenser roll holder with lockout feature(s)

The aperture is designed with an asymmetric shape that specifically matches the asymmetric geometry of the intended end cap. This asymmetric configuration allows the dispenser to selectively accept only the correct end cap type while rejecting incompatible ones, thereby maintaining operational reliability while preserving adaptability to the intended product range.

The end cap and aperture are designed as separate, modular components with simplified individual geometries. The end cap contains specific geometric features that correspond to matching features in the aperture, creating a simple interlocking relationship. This segmentation allows each component to be manufactured independently with straightforward processes while achieving reliable compatibility through their coordinated design.

Instead of adding active lockout mechanisms to prevent incompatible end caps, the design inverts the approach by creating a passive selection system. The aperture geometry is designed to naturally guide and accept only compatible end caps through their matching geometric features, while incompatible end caps are automatically rejected due to geometric mismatch. This inversion transforms a potential complexity issue into a simple geometric compatibility solution.