Just picked up a 02 Toro Z Master 52" for 900 bucks on CL Had to fix a few things but nothing to major. But I went to the mower shop and bought some new blades. They gave me blades with a 1/2" center hole. I came home and looked at the old blade and the hole is 5/8. So I search the internet and some sites say 5/8 and some say 1/2 so now I am confused... Would the 1/2 size center hole hurt anything? Anyone know the correct size??? Thanks everyone!!