Abstract: A width-adjustable drop-in stair system for an in-ground vinyl liner swimming pool includes a first and second drop-in step components having first and second lengths. The first and second drop-in step components are arranged as parts of a stair step that attaches to opposing sidewall panels of the swimming pool. The second drop-in step component is engaged in nested relationship with the first drop-in step component at a nesting overlap distance that is established to configure the stair step with a defined width dimension corresponding to a distance between the opposing sidewall panels to which the stair step is attached. The defined width dimension is less than the first and second lengths in total. The first and second drop-in step components are fastened together so as to be statically secured as parts of the stair step.

Abstract: A rigid frame structure has a corner retaining configuration for retaining a sheet member to an inside corner of the frame structure. First and second panel members are arranged to form the frame structure's inside corner. A gap of nominal gap width is disposed at the inside corner between a rear edge of the second panel member and a face of the first panel member. One or more retaining members partially close the gap to provide corresponding areas of reduced gap width. Each retaining member is formed on or attached to a surface of the first or second panel member that defines a first or second side of the gap without mechanical fastening to both sides of said gap. The nominal gap width is sized to receive one or more bead elements on the sheet member, and the reduced gap width traps the one or more bead elements within the gap, thereby retaining the sheet member to the inside corner.

Abstract: A rigid frame structure has a corner retaining configuration for retaining a sheet member to an inside corner of the frame structure. First and second panel members are arranged to form the frame structure's inside corner. A gap of nominal gap width is disposed at the inside corner between a rear edge of the second panel member and a face of the first panel member. One or more retaining members partially close the gap to provide corresponding areas of reduced gap width. Each retaining member is formed on or attached to a surface of the first or second panel member that defines a first or second side of the gap without mechanical fastening to both sides of said gap. The nominal gap width is sized to receive one or more bead elements on the sheet member, and the reduced gap width traps the one or more bead elements within the gap, thereby retaining the sheet member to the inside corner.