Lock with replaceable bottom pins

A lock comprising:

• a housing having a space defined axially therein, multiple top pin holes defined radially through the housing, the housing having multiple through holes which are located corresponding to the space, and
• a core being located in the space defined by said housing and having multiple bottom pin holes defined radially, the bottom pin holes communicating with the top pin holes respectively, a key hole being defined in a first end of the core and a connection member connected to a second end of the core, the key hole communicating with the bottom pin holes, the housing having a connection portion located radially offset to the connection member, the through holes being located axially offset to the bottom pin holes;
• the through holes communicating with the bottom pin holes when the bottom pin holes are rotated to the through holes, the core is moved axially and the connection member is aligned with the connection portion, the connection member is coupled to a transmission unit for rotation as a key is rotated to align at least one protrusion of the connection member with said connection portion of said housing whereby when said core is rotated to a predetermined angle, the core can be axially displaced for alignment between the bottom pin holes and the multiple through holes formed through the housing.