Retainer systems for ground engaging tools

A retainer system for a ground engaging tool, comprising:

• a retainer bushing including:
• an outer surface configured to mate with a lock cavity of the ground engaging tool;
• and
• an inner surface opposite the outer surface;
• and
• a lock including:
• a head portion having a tool interface configured to receive a tool for applying torque about a lock rotation axis;
• and
• a C-shaped portion extending from the head portion and defining a lock slot for receiving a portion of a support member to be locked with the ground engaging tool, the C-shaped portion including an outer surface configured to be rotatably received in the inner surface of the retainer bushing,
• wherein the head portion includes a wall extending in a plane substantially perpendicular to the lock rotation axis, the wall including:
• a first surface from which the tool interface extends;
• a second surface, opposite the first surface, from which the C-shaped portion extends;
• and
• a through-hole having a first end opening out to the tool interface and a second end opening out to the lock slot defined by the C-shaped portion.

A lock for a ground engaging tool, comprising:

• a head portion including a wall having a first surface and a second surface opposite the first surface, the head portion including a tool interface extending from the first surface of the wall;
• a C-shaped portion extending at an angle from the second surface of the wall and defining a lock slot for receiving a portion of a support member to be locked with the ground engaging tool, the C-shaped portion including an outer surface configured to be rotatably received in an inner surface of a retainer bushing;
• and
• a detent formed on the outer surface of the C-shaped portion andd configured to engage a detent of the retainer bushing,
• wherein the wall including a through-hole having a first end opening out to the tool interface and a second end opening out to the lock slot defined by the C-shaped portion.