A shaft sealing assembly is located in a suction chamber of a swash plate type compressor to seal the space between a drive shaft and a housing. The prepreg is characterized in that it further comprises a surface part consisting essentially of bioactive filler material, said bioactive filler material being in particle form and at least partially and at most partially embedded in said base part. Then, after exhausting the gas in the chamber, an oxidation gas is introduced into the chamber to react with the molecules of the source gas absorbed on the semiconductor wafer to form a metal oxide film on the semiconductor wafer. Accordingly, the click bolt can be installed by hand and rotationally locked without a need for high torque, and the click bolt can be easily removed by hand when the click member is moved to the disengaged position, axially free from the outer flange.