Web sensor

A web sensor for a vehicle safety restraint retractor comprising an inertia member (1), a locking pawl (6) and a lockcup (4), the inertia member (1) being eccentrically pivotally mounted to the lockcup (4), the locking pawl (6) being integrally formed with the inertia member (1), the lockcup (4) comprising a set of radially inwardly pointing locking teeth (5) for engaging with the locking pawl (6), wherein the shape and profile of the locking pawl (6) complements the shape of the locking teeth (5). The invention resists jamming of the retractor.