I'm having trouble removing the blade on an old brush hog. The mower is a 5 ft Pasture Dream Clipper made by Taylor Machine Works. I'd be afraid to guess how old it is, I bought it used 20 years ago and it looked very old then. The blade bar has a sleeve on top that fits on the shaft that comes out of the gear box. A heavy bolt goes up through the bottom of the blade bar into the shaft. I've never had the blade bar off but I assume there is either a key way or splines to keep the sleeve/blade bar from turning on the drive shaft. While under the deck to sharpen the blades I noticed a crack in the sleeve which I'm hoping can be repaired by welding. I can get a socket on the bolt that goes up through the bade bar, but it will not budge, even when using a cheater bar. I'm assuming the bolt is right hand threads, but maybe they are left handed. Anyone have any suggestions?