Engine vibration during use of the trimmers can cause wear on the fuel line, leading to a propane fuel leak. The Straight Shaft Trimmers' propane canister can crack at the neck during use. In addition, high temperatures may develop near the Curved Shaft Trimmers' plastic cutting guard, causing the guard to deform and fall off. These issues pose burn, fire and laceration hazards to the user.

Thank you to the US Consumer Product Safety Commission...