You might want to change the style of already inserted bolts - you'll need to update the bolt's style.
Although you find editable partlist data of each bolt within its PS Properties the bolts don't get updated (correctly):
Open the PS Bolt dialogue on tab Bolt Style; edit the requested values and store the style (perhaps create a new style):
In order to change particular bolts you can filter the objects by PS Search Parts across all the model by their NAME; you can use wildcard (*) as well:
Finally change the boltstyle collectively in the PS Properties by a "forward-backward-change" in the field Style.
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