摘要 |
An enclosure for mounting on a substrate includes a rigid tubular support member and a revolvable elastic sleeve having a double wall enclosing lubricant sealed therein. The sleeve is mounted on the support member in an expanded state with a portion of the inner wall of the sleeve secured to the support member so that the sleeve can be revolved over the end of the support member to contract elastically to a less expanded state while retaining a portion of the sleeve on the support. |