Check your snow blower’s owner’s manual to get the right shear pin size. Make sure the snow blower is turned off. While you have your hands inside the blade mechanism, pull the wire off the spark plug, so you know the snowblower won’t start. Remove anything jammed in the auger with the clean-out tool with your snowblower. Once the auger is free to move, crank it by hand until you see where the shear pin should go. Remove any residual shear pin fragments. It should be simple to remove. When they break, they may fall out entirely. Align the driveshaft holes until the replacement shear pin can be pushed into place. Tighten the nut on the shear pin’s threaded end. Manually rotate the auger to ensure the blades are in good working order. If that doesn’t work, look at the secondary shear pins to see if one of them is the issue. Remove the spark plug and reconnect it. Make sure the snowblower is turned on and working correctly.