If the nut isn't captive, you probably need to take it apart and grease the threads properly so the nut binds against the stem itself, rather than the bolt. The stem might be 26.4 rather than 26.0, but that can be coke shimmed
@TvH started
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If the nut isn't captive, you probably need to take it apart and grease the threads properly so the nut binds against the stem itself, rather than the bolt. The stem might be 26.4 rather than 26.0, but that can be coke shimmed