That works for wheel bearings, but deck bearings are spaced between the cones
in the spindle housing.
it is a pre determined length spacer.
possibly it worn shorter or was lost/forgotten/ omitted
You have to tighten the nuts tight or the blade will slip and come off.
You need to take the spindle apart and see what is wrong.
I am assuming you are working on the later style taper bearing spindle.
but that is just a guess.
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