if the deck is bent around the blade spindle, you can sometimes whack the hell outta it with a 3-5lb sledge and correct it...
i have a deck puller.. i cant explain how it works.. you could always spot a Sears mechanic in someone yard working on a machine and stop and ask him if he has one and could you see it..
i dont know where Sears got them from.. i think we made them.. anyway...hammer usually works...if jackshaft is bent.. you can turn the blade and if the blade bolt makes a relative oval instead of a clean circle when turning.. that is how i can tell.. i dont think that is your problem though...
<0. less than negative