I should probably delete that diatribe but I'm not going to. That's why I make it a habit to buy nothing used unless I look it over really well. There is absolutely nothing worse than rounding the flats off a nut by buggering it up or stripping a fastener by over torquing. A little finesse goes a long way and the right tool for the job goes even farther, especially when you have to go back at a later date and do it again and have to deal with your bugger up job a second time. I'll probably get some flack for this but farmers are notorious for not having the proper tools. I know a few who have 3 tools to work on everything. A 5 pound drilling hammer, a pair of vice grips and a 'crescent' wrench. If you can't loosen it with the 'crescent' wrench, beat the **** out of it and attack it with the vice grips...... If all that fails, call your buddy, have him bring a cold 12 pack and his 3 tools and maybe he can get the bastard apart.
I own a really nice Massey 1038 that the previous owner just about shoemakered into oblivion. If he lived close by I'd probably drop by his place and urinate in his gasoline tank.