Rekeyable lock

A rekeyable lock, comprising:

• a lock casing formed with a lock cylinder hole, a pin replacing hole and a plurality of first pin holes;
• a lock cylinder rotatably arranged in the lock cylinder hole, wherein the lock cylinder is formed with a plurality of second pin holes;
• a pin set, comprising:
• a plurality of first pins respectively accommodated in the first pin holes;
• and
• a plurality of second pins respectively accommodated in the second pin holes;
• and
• a pin cover arranged in the pin replacing hole, the pin cover comprising:
• a cover body formed with a groove;
• and
• a sliding block arranged in the groove and slidable relative to the cover body between a first predetermined position and a second predetermined position;
• wherein when the sliding block is located at the second predetermined position, the sliding block and the cover body are configured to respectively abut against an inner wall of the lock casing to fix the pin cover in the pin replacing hole;
• wherein the pin cover is configured to cover the whole pin replacing hole when the plurality of second pin holes are communicated with the pin replacing hole;
• wherein the pin cover is not rotatable relative to the lock casing when the lock cylinder is rotated relative to the lock casing.