Locking/ indexing pin

An apparatus, comprising:

• a body having an axis and including a plurality of walls defining an interior space, each of the walls has an aperture that is unobstructed and extends radially through the respective wall relative to the axis for allowing fluid communication between the interior space and an exterior environment, and a barrel extending from the body and configured to be mounted to an object, the barrel having a bore in communication with the interior space of the body;
• a sub-assembly configured to be removably attached to the body while the body is mounted to the object, the sub-assembly comprising:
• a pin operable to travel longitudinally within the interior space of the body and the bore of the barrel;
• a handle mounted to a handle end of the pin;
• a retainer removably disposed on the pin adjacent the handle;
• a clip removably mounted to a slot in the pin away from the handle;
• and
• a spring disposed on the pin between the retainer and the clip, wherein the spring is configured to:
• maintain an engagement end of the pin in an extended position beyond an end of the barrel when no actuating force is applied to the pin, and
• allow the engagement end of the pin to retract into the bore of the barrel when an actuating force is applied to at least one of the handle or the engagement end of the pin.