I thought my days of PITA blade changes were over. I went out and got a good quality impact wrench rated at 600 ft/lbs. I lifted up my Exmark and only got one blade off! After some PB Blaster lube I managed to get another off, but no luck on the third. I'm going to let the PB Blaster soak in a while. My question is how do I keep the blades from seizing on there? The last guy to change the blades was the dealer. Maybe they over torqued them, but I've had trouble before. Is it safe to use anti-seize compound on the bolts? Is there anything else I can try?