PURPOSE: To make the exchange of male-screw bolts easier by fixing male-screw bolts coated with a releasing agent to the inside of holes drilled in a base material with a curable fixing agent when the male-screw bolts are damaged.

CONSTITUTION: A curable fixing agent 3 is injected into a hole 2 drilled in a base material 1, and a male-screw bolt 4 coated with a releasing agent is inserted to the bottom and fixed in the hole 2. The releasing agent used is ones which can be easily removed out by turning the bolt 4 in the direction of screw after being fixed, e.g., vaseline, pomade, margarine, grease, paraffin wax, etc. By turning the bolt 4, the bolt 4 can be easily removed out or fitted and also can be easily exchanged.