Abstract: A joint apparatus for joining two objects together with end faces in face-to-face engagement includes first and second flat plates for attachment to faces of the respective objects adjacent the end face. Each plate has a first side edge for facing the first side edge of the other plate when secured to the respective object, and the first side edges each have at least one tongue and recess positioned for alignment with the recess and tongue of the other plate, respectively. The plates are positioned on the respective objects such that the tongues project out from the end face of the object and engage in the recess of the other plate when the end faces are abutted, in a zipper-like fashion. The plates may be temporarily clamped together while the tongues are secured to the face of the opposing object, thereby forming the joint.

Abstract: A joint apparatus for joining two objects together with end faces in face-to-face engagement includes first and second flat elongate plates for attachment to faces of the respective objects adjacent the end face. Each plate has a first side edge for facing the first side edge of the other plate when secured to the respective object, and the first side edges each have a series of alternating tongues and recesses positioned for alignment with the recesses and tongues of the other plate, respectively. The plates are positioned on the respective objects such that the tongues project out from the end face of the object and engage in the recesses of the other plate when the end faces are abutted, in a zipper-like fashion. The plates may be temporarily clamped together while the tongues are secured to the face of the opposing object, thereby forming the joint.

Abstract: A joint apparatus for joining two objects together with end faces in face-to-face engagement includes first and second flat plates for attachment to faces of the respective objects adjacent the end face. Each plate has a first side edge for facing the first side edge of the other plate when secured to the respective object, and the first side edges each have at least one tongue and recess positioned for alignment with the recess and tongue of the other plate, respectively. The plates are positioned on the respective objects such that the tongues project out from the end face of the object and engage in the recess of the other plate when the end faces are abutted, in a zipper-like fashion. The plates may be temporarily clamped together while the tongues are secured to the face of the opposing object, thereby forming the joint.

Abstract: A joint apparatus for joining two objects together with end faces in face-to-face engagement includes first and second flat elongate plates for attachment to faces of the respective objects adjacent the end face. Each plate has a first side edge for facing the first side edge of the other plate when secured to the respective object, and the first side edges each have a series of alternating tongues and recesses positioned for alignment with the recesses and tongues of the other plate, respectively. The plates are positioned on the respective objects such that the tongues project out from the end face of the object and engage in the recesses of the other plate when the end faces are abutted, in a zipper-like fashion. The plates may be temporarily clamped together while the tongues are secured to the face of the opposing object, thereby forming the joint.

Abstract: A double arbor has a shaft with a slideable first arbor at one end and a fixed second arbor at the other. A first hole saw of the already-cut, incorrect diameter is mounted on the first arbor. A second hole saw which is the size of the desired diameter hole is mounted on the second arbor. The assembly is attached to a drill or other rotating driving means and the first hole saw is placed into the existing opening where it acts as a pilot bit for the second hole saw. Use of the first hole saw as a pilot can also be applied to rabbeting, bevelling, grooving or sanding the existing hole by attaching different blades in place of the second hole saw.