A method and system for monitoring context information associated with a wireless communication entity for determining a potential occurrence of a network disruption for that wireless communication entity. A tensioning fork is positioned at a first side edge and proximate a first end edge of the material. Analysis data for each stock corresponding to a coming time interval is estimated based on the corresponding clustering data. At the same time, in accordance with the movement of the slider, an engaging shaft of the slider causes a pivotal engaging member to pivot and comes into engagement with an engaging recess after a predetermined amount of the pivotal movement.