How do you tighten the chain on a McCulloch Power Mac 442 chainsaw?

To tighten the chain on a McCulloch Power Mac 442 chainsaw, first ensure the saw is turned off and unplugged. Locate the chain tensioning screw, usually found on the side of the guide bar. Use a flathead screwdriver to turn the tensioning screw clockwise to tighten the chain until it sits snugly against the bar, but can still be pulled slightly by hand. Finally, check the chain's tension and ensure it moves freely before replacing any covers or starting the saw.