Inspection robot having replaceable sensor sled portions

A method, comprising:

• providing an inspection robot comprising:
• a plurality of payloads and a plurality of arms, wherein each of the plurality of arms is pivotally mounted to one of the plurality of payloads;
• a plurality of sleds, wherein each sled is mounted to one of the plurality of arms, and wherein each of the plurality of sleds comprises an upper portion coupled to a replaceable lower portion, each replaceable lower portion having a bottom surface that engages an inspection surface;
• and
• a plurality of inspection sensors, wherein each of the plurality of inspection sensors is coupled to the upper portion of one of the plurality of sleds;
• removing one of the replaceable lower portions of one of the plurality of sleds by twisting the one of the replaceable lower portions to disengage a slot of the one of the replaceable lower portions with a key of the upper portion of one of the plurality of sleds;
• and
• replacing the one of the replaceable lower portions of the one of the plurality of sleds by twisting a replacement lower portion to engage a slot of the replacement lower portion with the key of the upper portion of one of the plurality of sleds;
• wherein twisting the replacement lower portion comprises rotating the replacement lower portion about an axis centered on one of the inspection sensors of the plurality coupled to the upper portion of the one of the plurality of sleds.