Shop injuries often can happen when something is difficult to remove and excess pressure is applied. When using heavy force, especially with tools like a screwdriver or a needle-nose pliers, think ahead to what will happen if the tool slips off. If it could hit a part of your body, search for an alternative removal method.
At the start of the season, add fresh gas and new engine oil to your snowthrower. Check the machine’s auger and impeller and make sure that the air filter and spark plugs are clean. At the end of the season, drain the gas and oil from the engine and clean the machine before storing it.