I have a Bush Hog brand Rotary cutter I bought off a guy used. One of the Blades came of last fall when I was using it. I found the blade and Blade bolt but not the nut. Needless to say I need to replace the whole assembly the threads on the blade bolt are too beat up at this point to hold a nut. Called around to all the bush hog dealers without a model number no one has any idea what the blade bolt number could be. The rotary cutter is a 60" diameter. The blade bolt is 3 3/4" in diameter at the head and the threaded part is 1 3/8" diameter fine thread (12 TPI). Any thoughts would be appreciated.