I am doing my first blade change today after putting new spindles maybe a year ago or a bit longer. I'm not sure if I didn't tighten the blades down enough the first time, or if I just hit something tough enough, but the star pattern on my spindles have been ground down and smashed outwards to where the blades no longer fit actually on them. It mows fine with no clatter with the old blades. My question is should I either a) buy new spindles b) grind the star tits down to where the blade can fit over it again or c) tighten the crap out of my nuts and call it good.