Renewable bushings to guide the tool are for use in liners. They are used where the bushings will wear out or become obsolete before the jig or where several bushings are to be interchangeable in one hole. They are usually made with a knurled head to facilitate removal. There are “fixed” and “slip” milled notches combined on the head of renewable bushings. There is one type of renewable bushing: slip-fixed renewable. (a) The fixed side of the renewable bushing is used with the intention of leaving it in place until worn out. (b) The slip side of the renewable bushing is used with the intention of changing it frequently in a given size of liner.
All dimensions are given in inches.