Abstract: The invention relates to a retaining element of plastic having a captive fastening part located therein and to a method of mounting lines on an article. In this case, the retaining element has at least one line receptacle, at least one cavity for the captive accommodation of a fastening part, at least two pivotable tongues in the wall of the cavity, with in each case a retaining member directed into the cavity and intended for accommodating a radially projecting section of the fastening part in a preassembly position, a tool entry opening of the cavity, and a bearing surface, serving as final assembly position, on the bottom of the cavity. The cavity is preferably formed by three finger-like catch hooks.

Abstract: An inline skate having an inline skate wheel; an in line skate axle which extends through the inline skate wheel and has a female receiving element; an inline skate frame which supports the inline skate axle, wherein the inline skate axle has a first contacting surface for contacting the inline skate frame; a securing element that has a second contacting surface for contacting the inline skater frame, and a male thread element for engaging the female receiving element of the inline skate axle, and a positive acting element for exerting a retention force against the inline skater frame, wherein the female receiving element does not have threads prior to engagement of the female receiving element with the male thread element, and wherein the male thread element is a self forming thread which forms a thread in the female receiving element upon engagement.