There are two main reasons to reuse spindle nuts, Cost and keeping spindle bushing wear consistent across the spindle bar. Until spindle end play exceeds service limit nut/bushings don't require replacement. By replacing spindles and reusing spindle nuts you can save over $2.75 per spindle. On average a 6 row picker can require around 1200 spindle replacements a year, a savings of $2.75 per spindle equals $3,300 per year!