While replacing my upper balljoints, I came across the adjustment sleeves threaded into the upper half of the the axl yokes. My new balljoints came with replacements, but I was wondering how necessary it is to replace these parts? The auto parts store sells the spanner wrench to remove them for about $30, but I'd rather not buy this tool just for a one-time use. Please let me know if I should replace them, and/or how to check them for wear/damage. Thanks.