the system is applicable to any system having need for a positive stop at the end of a period of travel . in a vertical blind track system , a lead carrier which is typically manipulated by a control wand with universal linkage can include an installable and removable end stop engagement structure . this structure fits onto conventional lead carriers within a slot which is upwardly directed and at one side of the lead carrier . the installable and removable end stop engagement structure has a wide lateral slot , and including a first engagement member for engaging an edge of one end of the slot on the lead carrier , and a second engagement member which is angled and placed next to an extension to facilitate manual engagement and removal of the installable and removable end stop engagement structure . once mounted in place , it aligns with , and is force or momentum inserted into and through a stop engagement aperture .