Abstract: A telescopic assembly (1) has a first resilient tube (2) and a second resilient tube (3) that have end-to-end openings between opening edges (4, 5, 7, 8) at circumferential overlaps (6, 9) or alternatively at gaps (24, 25). The resilient tubes can be cylindrical (22, 23), rectangular (26, 27) triangular (28, 29) or otherwise polygonal. The end-to-end openings provide design snugness of telescopic fit for telescopic length adjustment without the need for precise measurement or cutting. The telescopic assemblies are aftermarket-attached with a wall screw (32) or surface covering (42) to surfaces (31, 34, 41) of desired structures and adjusted telescopically for distances between an electrical item, such as a fan (37), and a controller such as a control switch or electrical outlet (36). Cord (38) such as an electrical line or mechanical actuators are inserted in the telescopic assemblies and in any tube elbow (35) or other joint en route from the control switch to the electrical item.