Abstract: A valve includes a chamber having an inlet, an outlet, and an annular recess. A movable element is disposed in the chamber to control the flow of fluids between the inlet and the outlet. A stem is secured to a movable element and extends exteriorly through the annular recess. A seal and a fastener are disposed around the stem. The fastener is in displaceable engagement and disengagement with the stem and has recesses formed in each of its exterior side surfaces. A plurality of mounting pads are positioned around the annular recess. The mounting pads are elevated to provide separation between the fastener recesses and a peripheral surface. A method of constructing the mechanical valve includes tightening the fastener around the stem by engaging a recess with an axial tool.