RE: Is "center-shot"....."center"?
All good advice, and one of the main reasons you'll remember I fell in love with the Muzzy Zero Effect years ago; it allows for the arm to drop down behind the shelf instead of slapping onto it.
Kanga gave you good advice (as most everyone did); and yes, LAS sells the Hicks slides. Several of the Pro Staffers swear by them, and it's one of the first things I replace on a standard cable-guard bow.