Adjustable endless loop tape cartridge with shipping lock

In a cartridge comprising:

• a housing adapted to be received in a machine and having access openings adapted to receive heads and a tape drive mechanism in said machine;
• a cylindrical hub attached to said housing at a position spaced from said access openings, said hub having a central opening and a slot extending axially across the full width of the hub and communicating with said central opening;
• an endless length of tape having a major portion wrapped about said hub to form a coil and a minor portion extending from the innermost wrap of the coil through said slot into said central opening, and around the side surface of the coil to the outermost wrap of the coil;
• and
• means on said housing for defining a tape path for and producing tension in said minor portion, comprising means for guiding said minor portion past said access openings in a predetermined position for engagement by the heads and drive mechanism of the playback machine, a guide pin guiding said minor portion between said access openings and the outermost wrap of said coil, means mounting said guide pin for movement between a first position providing a first path length between said access openings and said coil and a second position providing a second path length longer than said first path length between said access openings and said coil, and means for biasing said guide pin toward said second position with a low force to provide a low tension in the outermost wrap of the coil, the improvement wherein:
• said hub comprises a flexible cantilevered portion having a first end partially defining said slot, having a second end spaced from said first end that is fixed on said housing, and being separated from said housing between said first and second ends, and said cartridge comprises an adjustment member movably mounted on said housing and having a surface contacting said cantilevered hub portion, said adjustment member being movable to change the position of the surface contacting said cantilevered portion and thus change the position of said cantilevered portion radially of said hub to adjust the length of said minor portion and position said guide pin at a predetermined position between said first and second positions.