A very common occurrence, impacts are typically from shallow water obstructions such as rocks, stumps, or oyster bars, or even dragging the drive on the boat ramp or road. Impact damage can usually be remedied; f the impact is just to the skeg (below the bullet), the damage can sometimes be repaired by welding or replacing the skeg. This must be done by a skilled welder who knows metallurgy well, because a poor or incorrectly performed weld can easily break. This is especially critical in high speed (55+ mph) applications, because at higher speeds, with a drive that is raised up higher for lower drag, the skeg takes on a lot of side forces not normally applied in lower speed craft. If the lower unit bullet is damaged, the damage is typically not repairable, and the drive should be replaced. In some cases, the impact damage occurs on dry land; the driver backs the rig into a tree, fence, another vehicle, etc.