An expander for mounting a resilient outer tubular article over an elongate article comprising: a chassis element which is generally symmetric about a longitudinal axis ; at least one radially outwardly movable elements which are selectably engageable with at least a portion of said resilient outer tubular article ; and a driver which is movable axially with respect to said chassis element and is operative to selectably engage said at least one radially outwardly movable elements , when said radially outwardly movable elements are in engagement with said at least a portion of said resilient outer tubular article , for producing corresponding radial outward motion and radial outward expansion thereof; wherein each of the at least one radially outwardly moveable elements is pivotally mounted on the chassis element ; each of the at least one radially outwardly moveable elements has a spring to urge the at least one radially outwardly moveable elements to pivot radially outwardly relative to the longitudinal axis ; each of the at least one radially outwardly moveable elements has a hand-engageable outer-facing edge surface for applying a force to pivot the at least one radially outwardly moveable elements radially inwardly relative to the longitudinal axis , against bias from the springs ; and the expander further comprises an engagement element , removably mounted on a forward end of said driver , for insertion into said at least a portion of said resilient outer tubular article upon expansion thereof by operation of said driver , said engagement element being configured to accommodate at least a portion of said elongate article . a chassis element which is generally symmetric about a longitudinal axis ; at least one radially outwardly movable elements which are selectably engageable with at least a portion of said resilient outer tubular article ; and a driver which is movable axially with respect to said chassis element and is operative to selectably engage said at least one radially outwardly movable elements , when said radially outwardly movable elements are in engagement with said at least a portion of said resilient outer tubular article , for producing corresponding radial outward motion and radial outward expansion thereof; wherein each of the at least one radially outwardly moveable elements is pivotally mounted on the chassis element ; each of the at least one radially outwardly moveable elements has a spring to urge the at least one radially outwardly moveable elements to pivot radially outwardly relative to the longitudinal axis ; each of the at least one radially outwardly moveable elements has a hand-engageable outer-facing edge surface for applying a force to pivot the at least one radially outwardly moveable elements radially inwardly relative to the longitudinal axis , against bias from the springs ; and the expander further comprises an engagement element , removably mounted on a forward end of said driver , for insertion into said at least a portion of said resilient outer tubular article upon expansion thereof by operation of said driver , said engagement element being configured to accommodate at least a portion of said elongate article . <EOS>