A mechanically joined connection includes a tubular extension having a wall defining an interior space, and an insert member having a protruding end, the protruding end being configured to be inserted into the interior space of the tubular extension. The protruding end has an irregular outer surface and the wall is inwardly extruded into close frictional contact with the irregular outer surface around the circumference of the tubular extension, whereby the tubular extension is frictionally and reliably retained on the insert member without the need for separate fasteners. In particular, a wiper pivot assembly for a vehicle is shown including a connecting tube and a pair of pivot forming members mechanically joined at the ends of the tube. Also, a jack extension tube for a vehicle seat is shown including a jack extension screw and nut, and an extension tube mechanically joined to the nut.