I've also seen a frog that had the 'web' of cast iron between the two frog screws snapped off. This is rare damage, but it just goes to show you that these planes can be damaged anywhere and it's just good practice to examine them thoroughly before you buy. Some planes are missing their lateral adjustment lever. It's attached to the top of the frog with a small, peened over pin. Through hard use, the pin can wear out, detaching the lever from the frog. If the hole is not present, the plane is an earlier model that dates prior to the introduction of the lateral lever which made its debut in the first lateral has a bent up edge that engages the cap iron, while the later style, first introduced in , has a circular disk to engage the cap iron.