The layer of {HEAD ~ high friction} resilient material is preferably constructed and arranged for providing a braking surface to prevent vertical movement of {TAIL ~ the window sash} when the sash is tilted away from the vertical axis of the jamb liner and the high friction resilient material is contacted by the locking means 
The layer of { HEAD ~ high friction } resilient material is preferably constructed and arranged for providing a braking surface to prevent vertical movement of { TAIL ~ the window sash } when the sash is tilted away from the vertical axis of the jamb liner and the high friction resilient material is contacted by the locking means
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