I own a 60" promaster 260 Z rider (2000 model) and can't seem to remove the center blade bolt. I have soaked the proper area with penetrating oil overnight and tried removing first with a 1/2" air impact and then a 3/4" with no luck. Then I applied heat to the bolt and tried the 3/4" impact again and still would not budge. I am guessing that my guys hit a rock really hard or something because the blade bolt is frozen stiff. I am in fear of trying a 1" impact due to the extreme force that could shear the head of the bolt off. Can I gain access to the bolt through the top of the spindle? Any suggestions or input would be greatly appreciated, Thanks!