A disk cartridge comprising a flat housing and a recording disk medium. The method includes the steps of: operating in an open loop control mode of the real position; operating in a closed loop control mode of the real position; and alternatively selecting the open loop control mode and the closed loop control mode. The first threaded hole is defined in the tubular body, communicates with the air outlet, and has a first thread specification and an inner diameter. Upon identification of the audio portion, the audio signal may be controlled to mute the audible objectionable text. The screen printing apparatus carries in substrates based on substrate carrying-in order data which is determined so that alternate carrying-in in which a first type substrate and a second type substrate are alternately carried in and continuous carrying-in in which the first type substrate or the second type substrate which has a shorter line tact time is continuously carried in are mixed. Movement of the manual actuator is always resisted by a first elastic member while a second elastic member is positioned to resist movement of the manual actuator at a maximum of 30N to 50N after 60% or more of the total movement of the manual actuator required to produce a spark has occurred.