Abstract: A boring stand for supporting engine blocks or cylinders which are to be bored that has a moveable platform which is slidably mounted on a vertical upright of a stand and has polyethylene wear plates engageable with a vertical upright. The moveable platform has a cable with one end which connects to an upper portion of the stand and a lower portion which passes around a reel within the platform structure which can be driven by a worm wheel and worm and which has a crank handle attached to the worm. The worm and worm wheel assures that the platform will stay in a preset position after adjustment and allows the platform to be positioned to any desired height.

Abstract: A plurality of cutter tool holders are mounted to a milling cutter head by tongue and groove connections. Each connection comprises a groove formed in the cutter head and a tongue formed on the tool holder. The groove has an undercut portion and an enlargement at one end. The tongue includes a projection which can be inserted into the enlargement and then into the undercut to prevent, via wedging action, dislodgement of the tool holder. The groove and tongue each includes a side wall which is straight along its height.