A guide assembly includes a sleeve-shaped member having first and second ends. At least one insert member is positioned within one of the ends of said sleeve-shaped member, the insert member including an end-to-end channel. A guide bar extends through the sleeve-shaped member and along the end-to-end channel of the insert member. A first end of the guide bar extends from the first end of the sleeve-shaped member and a second end of the guide bar extends from the second end of the sleeve-shaped member. A second insert member positioned in the other end of the sleeve-shaped member may also be provided.