Re: Pulley Spindle seized
AND on some of them decks you can leave the blade on the spindle shaft, take the top pulley off drop the shaft out the bottom, remove the bearings (upper and lower and the center spacer collar) from the spindle housing. Sometimes them blade nuts are really on tight and rusted is why I just leave the blade on the shaft when taking them apart. (saves some sweat)
You can sharpen the blade while it's off and still on the shaft with a grinder if desired and re-install all and torque. If you want the blade off the shaft AFTER it's off the deck just place the BLADE in a vise and remove the blades spindle nut. The blade nut will then usually come off easier next time when you need to remove just the the blade for sharpening.
(don't put the shaft in the vise and damage it)
Putting the deck up on a stand off the ground really helps and a Impact wrench is a good thing.
If one spindle is worn out the other spindles if same age is also on their last leg.
If the spindle housing are aluminum and use self tapping bolts, most generally if you try to remove the self tapping bolts they twist off and a complete new spindle is required.
I've had good luck with replacement bearings by taking the numbers off the old bearings and looking on flea bay for a package deal on the bearings.
Do as Whirly suggests saves some big bucks.