yes they do make differnt diameter bolts. if the bolt is out why are you trying to reinstall it if the stem is stuck? I would use the largest diameter bolt I coult get through the hole to tap the wedge out of the way. you have applied that PB blaster stuff yes?
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk