Apparatus and methods for securement of lines to downhole well tools. A method of securing one or more lines to a well tool includes the steps of: installing the one or more lines in a groove formed longitudinally along an outer surface of the well tool, the groove having a width at the outer surface of the well tool which is narrower than a width of the groove at a position radially inward relative to the outer surface; and securing the one or more lines in the groove. A well tool includes a groove formed longitudinally along an outer surface of an outer housing of the well tool. The groove has a width at the outer surface of the well tool which is narrower than a width of the groove at a position radially inward relative to the outer surface. One or more lines are secured in the groove.