I'm new. I have a Champion post drill. Only markings or castings are Champion Forge & Blower Lancaster PA. There is a number 4 on the advancing arm and the side of the drill. Is this a Model 4? I do know it is a 2 speed, with a 15 inch flywheel. The distance from the metal post to the drill bit is 9 inches. It weighs 157 lbs. Any ideas?