Abstract: A locker retractor for seat belt harness and the like which includes an interposer element articulated by movement of the drum or reel to selectively block or release a spring biased pawl bar and holding the pawl bar away from locking a ratchet on one or both of the reel flanges or selectively freeing the pawl bar so that it may lock the ratchet in prevention of further drum rotation in the withdrawal direction. The shift from blocking to non-blocking position is achieved by a slight retraction of the webbing after initial free withdrawal, whereupon the interposer element falls free of its blocking relation. The interposer is a latch-like element pivotally and slidably connected to the frame and oriented and frictionally directed by a ring element turned by the moving of the drum. The interposer described is also useful in providing quiet free-pull and retraction in inertial retractors as described in copending application Ser. No. 258,576 filed on June 1, 1972 now U.S. Pat. No. 3,865,320.