Re: Spindle reinforcement rings
I believe the reinforcing ring for the 62C deck is M150229. I have not done it yet but have given it some thought for my deck. I suspect it is probably best if tack welded to the deck between the screw holes.
One thing I did do this year with my 62C is to fine tune the blade alignment by using washers as shims at the spindle mount screws. You want to have the belt off with the deck tilted up to do this. Rotate the blades and see how the tips line up, also use a straightedge across blades at various positions. It actually made a significant improvement to the cut, which now has that golf course look to it. And, it is cheap!