Adjustable machine handles have a long bar grip for a firm hold to operate and make adjustments to machinery, equipment, and components. Teardrop-style adjustable handles have a lobed end that keeps hands from slipping off while turning the handle. Ball-style adjustable handles have a round end that allows a fingertip hold to make precise adjustments and acts as a stop to keep hands from slipping off when gripping the bar overhand. Adjustable tension levers lock into position to maintain clamping force and prevent loosening from vibration.